The Principle
Perjury - the willful false statement under oath in a judicial proceeding - is among the most ancient of criminal offenses and among the most directly traceable to biblical commandment. The Ninth Commandment's prohibition on false witness, the Deuteronomic talion applied to perjurers, and the canon law tradition of treating perjury as a spiritual as well as legal wrong combined to produce the perjury law that all modern jurisdictions inherit.
Biblical Foundation
Exodus 20:16 states the commandment directly: 'You shall not give false testimony against your neighbor.' The Hebrew phrase lo ta'aneh vere'acha ed shaqer means literally 'you shall not answer against your neighbor as a false witness.' The forensic context is specific - this is testimony in a legal proceeding, not just lying in general - and the injury is to a specific identified neighbor, making false witness a form of targeted wrongdoing rather than general dishonesty.
Deuteronomy 19:16-21 provides the punishment for false witnesses in capital cases: 'If a malicious witness takes the stand to accuse someone of a crime, the two people involved in the dispute must stand in the presence of the LORD before the priests and the judges who are in office at the time. The judges must make a thorough investigation, and if the witness proves to be a liar giving false testimony against a fellow Israelite, then do to the false witness as that witness intended to do to the accused. You must purge the evil from among you.'
The lex talionis applied to false witnesses - 'do to him as he intended to do to his brother' - is one of the most elegant deterrent mechanisms in ancient law. It makes the perjurer's sentence a function of his victim's potential sentence: if you falsely accuse someone of a capital offense, your false witness is itself a capital offense. This reciprocal sanction directly addresses the malicious prosecution that false witness enables.
Historical Transmission
Roman law similarly criminalized false testimony (falsum testimonium) as part of the broader Lex Cornelia de Falsis (81 BC), which addressed all forms of forgery and false representation. Medieval canon law treated perjury as both a canonical and a moral offense, requiring confession and penance as well as secular punishment. The church's jurisdiction over perjury cases - because perjury was an offense against an oath sworn before God - meant that ecclesiastical courts were involved in perjury prosecutions until Protestant reformers secularized the jurisdiction.
The Statute of Perjury of 1563 (England) was the first comprehensive English legislation on the offense, establishing it as a secular crime with defined penalties independent of canonical sanction. Parliamentary debates at the time of its passage explicitly invoked the Ninth Commandment and Deuteronomy 19 as the biblical warrant for criminalization - making the statute one of the most clearly documented cases of biblical commandment translated directly into criminal legislation.
The common law's subsequent development of perjury doctrine drew on both the Roman Lex Cornelia and the biblical model. The requirement of a direct false statement (not merely an ambiguous one), the requirement that the false statement be material to the proceeding, and the requirement of willfulness all reflect the Deuteronomic model's focus on intentional false witness in a formal legal context.
Key Champions
The Puritan legal tradition was the most vigorous champion of perjury prosecution in early modern England and America. Puritan magistrates treated perjury as a direct violation of the Ninth Commandment that threatened the entire legal order - if witnesses could not be trusted, no justice was possible. Cotton Mather's sermons on the Ninth Commandment elaborated its legal implications in terms that shaped New England legal culture's particularly strict treatment of testimonial dishonesty.
Modern Application
Perjury is a federal crime under 18 U.S.C. § 1621 (perjury in court proceedings) and § 1623 (perjury before congressional committees and grand juries) and a felony in all 50 states. The penalties reflect the seriousness with which perjury is treated: federal perjury carries up to five years imprisonment; state penalties vary but typically range from 1-15 years for felony perjury.
The most significant modern development in perjury law concerns the relationship between perjury and obstruction of justice. Clinton v. Jones (1997) and the subsequent Clinton impeachment proceedings focused public attention on the elements of perjury under oath - particularly the materiality requirement and the intent standard - in ways that demonstrated how ancient the legal issues were even in a contemporary political context.
Scholarly Debate
Legal scholars debate whether perjury is adequately deterred by current prosecution rates - which are very low relative to estimated rates of false testimony. Studies suggest that perjury is routine in certain categories of cases (asylum applications, domestic violence proceedings, drug cases) but rarely prosecuted, because prosecutors are reluctant to bring cases that require proving intent and materiality beyond reasonable doubt. Some scholars argue that the biblical model - automatic application of the intended punishment to the perjurer - would be more deterrent than current practice; others argue that the required investigation of the first proceeding to determine whether testimony was false creates practical barriers to prosecution that cannot be overcome without significant institutional reform.
Comparative Perspective
The Ninth Commandment's forensic specificity reflects the Israelite legal tradition's understanding that the integrity of the judicial process is a theological concern. The judge who accepts false testimony, the witness who gives it, and the accuser who procures it all offend against the God who is himself the ultimate Judge (Deuteronomy 1:17). This theological grounding gives perjury a moral gravity that purely secular accounts cannot fully replicate. The contemporary decline of oath-taking as a meaningful religious act raises the practical question whether perjury prosecution provides comparable deterrence to the traditional invocation of divine sanction -- a question that matters for the effectiveness of perjury law as well as its theoretical foundations. The high rate of what scholars estimate to be undetected perjury in modern courts suggests that the secular deterrence mechanism may be insufficient when divorced from the theological seriousness the oath originally provided.