Wallace Ward appeals his conviction of three counts of attempt to evade income tax in violation of 26 U.S.C. § 7201 and three counts of failure to file income taxes in violation of 26 U.S.C. § 7203 . Ward argues that a new trial is necessary because the district court did not allow him to swear to an oath of his own creation, thereby precluding him from testifying in his own defense. We reverse and remand for a new trial.

BACKGROUND

Ward is the president of I & O Publishing Company, a mail-order house and publisher located in Boulder City, Nevada. The prosecution presented evidence at trial that despite having substantial income, neither I & O nor Ward filed tax returns or paid income taxes for the years 1983, 1984 and 1985.

On March 29, 1990 a grand jury indicted Ward on three counts each of tax evasion and failure to file income tax returns. Ward chose to represent himself at trial. On July 9, 1990, Ward filed a “Motion to Challenge the Oath,” which proposed an alternative oath that replaced the word “truth” with the phrase “fully integrated Honesty.” The oath would read, “Do you affirm to speak with fully integrated Honesty, only with fully integrated Honesty and nothing but fully integrated Honesty?” For reasons we will not attempt to explain, Ward believes that honesty is superior to truth. Magistrate Lawrence R. Leavitt ruled on August 2, 1990 that “the oath or affirmation which has been administered in courts of law throughout the United States *732 to millions of witnesses for hundreds of years should not be required to give way to the defendant’s idiosyncratic distinctions between truth and honesty.” The district court overruled Ward’s objections to the magistrate’s order on August 28, 1990, and again on October 8, 1990. Ward pursued an interlocutory appeal on the issue, which was dismissed for lack of jurisdiction. United States v. Ward, No. 90-10534 (9th Cir. April 24, 1991).

A three-day trial commenced on February 11, 1991. Ward made a lengthy opening statement and actively cross-examined government witnesses. At a sidebar during the second day of trial, Ward offered to take both the standard oath and his oath. The prosecutor was amenable to the compromise, but the district court refused to allow it. “This is an oath that has been used for a very long time,” the district court said, “And I’m not going to establish a precedent where someone can come in and require the court to address that matter differently.” At the close of the government’s case on the third day of trial, Ward asked once again to testify under his oath. The judge again refused, saying “[T]he oath has been used for a very long time_ That’s the oath that will be administered.” Ward did not testify and presented no witnesses. The jury convicted Ward of all counts after an hour’s deliberation.

Ward now appeals. He argues that the district court’s insistence on an oath that violated his beliefs abridged his First Amendment right to free exercise of religion and his Fifth Amendment right to testify in his own defense.

DISCUSSION

Questions of trial management are ordinarily reviewed for abuse of discretion. United States v. Goode, 814 F.2d 1353, 1354 (9th Cir.1987). However, this case turns on the defendant’s First and Fifth Amendment rights. We review questions of constitutional law de novo. United States v. McConney, 728 F.2d 1195, 1203 (9th Cir.) (en banc), cert. denied, 469 U.S. 824 , 105 S.Ct. 101 , 83 L.Ed.2d 46 (1994).

Judges may not determine the truth or falsity of matters of faith. Even so, we must determine as a threshhold matter whether Ward’s beliefs are within the ambit of the First Amendment. In order for Ward to invoke “the protection of the Religion Clauses, [his] claims must be rooted in religious belief.” Wisconsin v. Yoder, 406 U.S. 205, 215 , 92 S.Ct. 1526, 1533 , 32 L.Ed.2d 15 (1972). “Religious” beliefs are those that stem from a person’s “moral, ethical, or religious beliefs about what is right and wrong” and are “held with the strength of traditional religious convictions.” Welsh v. United States, 398 U.S. 333, 340 , 90 S.Ct. 1792, 1796 , 26 L.Ed.2d 308 (1970). 1 While Ward does not describe his beliefs in terms ordinarily used in discussions of theology or cosmology (although he at one point uses the term “atheistic”), he clearly attempts to express a moral or ethical sense of right and wrong. Ward’s actions are evidence of the strength of his convictions. He strongly professes innocence of the crimes charged, yet he preferred to risk conviction and incarceration rather than abandon his version of the oath. We conclude that Ward professes *733 beliefs that are protected by the First Amendment.

The court’s interest in administering its precise form of oath must yield to Ward’s First Amendment rights. To begin with, there is no constitutionally or statutorily required form of oath. Federal Rule of Evidence 603 requires only that a witness “declare that the witness will testify truthfully, by oath or affirmation administered in a form calculated to awaken the witness’ conscience and impress the witness’ mind with the duty to do so.” The advisory committee notes to Rule 603 explain that “the rule is designed to afford the flexibility required in dealing with religious adults, atheists, conscientious objectors, mental defectives, and children. Affirmation is simply a solemn undertaking to tell the truth; no special verbal formula is required.” This rule represents no break with the common law, which recognized that

6 Wigmore, Evidence § 1818 (Chadbourne rev. 1976) (original emphasis).

Our cases have routinely held that it is reversible error for a district court to prevent a party from testifying solely on the basis of the party’s religiously-based objections to the form of the oath. In Gordon v. State of Idaho, 778 F.2d 1397 (9th Cir.1985), a plaintiff in a § 1983 action professed religious objections to oath or affirmation, offering instead to say “I understand that I must tell the truth. I agree to testify under penalty of perjury.” Using First Amendment analysis requiring that government use the “least restrictive means” to its ends when free exercise is at stake, we held that it was an abuse of discretion for the district court to insist upon the standard oath and to dismiss plaintiff’s case for failure to present evidence. See also Ferguson v. C.I.R., 921 F.2d 588 (5th Cir.1991) (tax court proceeding, similar facts). Criminal trials additionally implicate the defendant’s Fifth Amendment right to testify.

United States v. Looper, 419 F.2d 1405, 1407 (4th Cir.1969). See also Moore v. United States, 348 U.S. 966 , 75 S.Ct. 530 , 99 L.Ed. 753 (1955) (per curiam) (criminal defendant with religious objections to the word “solemnly” in the oath must be allowed to testify).

Neither the magistrate nor the district court, cited to any of these authorities, relying instead on their perception that the standard oath had not changed “for hundreds of years.” While oaths including the familiar “truth, whole truth, and nothing but the truth” formulation date back at least to the seventeenth century, see 6 Wig-more, Evidence § 1818(2) (Chadbourne rev. 1976), the principle that the form of the oath must be crafted in a way that is meaningful to the witness also predates our constitution. In Omichund v. Barker, 1 Atk. 22, 45 (1744), Lord Chief Judge Willes wrote, “It would be absurd for [a non-Christian witness] to swear according to the Christian oath, which he does not believe; and therefore, out of necessity, he *734 must be allowed to swear according to his own notion of an oath.” See also Atcheson v. Everitt, 1 Cowp. 382, 389 (1776) (Mansfield, L.C.J.) (“[A]s the purpose of [the oath] is to bind his conscience, every man of every religion should be bound by that form which he himself thinks will bind his own conscience most”).

This case has an odd twist in that the defendant offered to take the traditional oath if he could also take his own. His own oath superimposed on the traditional one would have taken nothing away from the commitment to tell the truth under penalties of penury and, indeed, in the defendant’s mind imposed upon him a higher duty. Under these circumstances the district court clearly abused its discretion in refusing the oath and preventing the defendant’s testimony. We do not have a case where the witness offers to swear only to a cleverly worded oath that creates loopholes for falsehood or attempts to create a safe harbor for perjury as in United States v. Fowler, 605 F.2d 181, 185 (5th Cir.1979), cert. denied, 445 U.S. 950 , 100 S.Ct. 1599 , 63 L.Ed.2d 785 (1980), where the court properly refused testimony from a defendant who would not say so much as “I state that I will tell the truth in my testimony,” and was willing to say only “I am a truthful man” or “I would not tell a lie to stay out of jail.”

Ward also seeks to vindicate what he perceives to be his right to have all his witnesses sworn to his oath. This he cannot do. Ward has no standing to assert the First or Fifth Amendment rights of others. Hong Kong Supermarket v. Kizer, 830 F.2d 1078, 1081 (9th Cir.1987). Ward also alleges numerous trial errors which we need not consider in light of our grant of a new trial.

REVERSED and REMANDED.

. We recognize that the Welsh test was propounded by a four-justice plurality in the context of construing the statutory term "religious training and belief’ as it appears in the conscientious objector exception to the Selective Service Act. However, Justice Harlan’s concurrence adopted the plurality's test as a matter of constitutional interpretation. 398 U.S. at 345, 356-61 , 90 S.Ct. at 1799, 1805-07 (Harlan, J., concurring). Courts regularly use the Welsh test to determine whether belief is "religious” for First Amendment free exercise purposes. See Mozert v. Hawkins County Board of Education, 827 F.2d 1058, 1078 (6th Cir.1987), cert. denied, 484 U.S. 1066 , 108 S.Ct. 1029 , 98 L.Ed.2d 993 (1988); Grove v. Mead School District, 753 F.2d 1528 , 1537 (9th Cir.) (Canby, J., concurring), ce rt. denied, 474 U.S. 826 , 106 S.Ct. 85 , 88 L.Ed.2d 70 (1985); International Society for Krishna Consciousness, Inc. v. Barber, 650 F.2d 430, 440 (2nd Cir.1981); See also Africa v. Commonwealth of Pennsylvania, 662 F.2d 1025, 1031-32 (3rd Cir.1981) (refinement of Welsh test), cert. denied, 456 U.S. 908 , 102 S.Ct. 1756 , 72 L.Ed.2d 165 (1982).