Definition
The physical act of touching one's lips to a copy of the Bible — or, in some traditions, a portion of it or a cross — as part of the ceremony of administering a corporal oath. The gesture serves as the outward, visible sign of the witness's or party's acceptance of the oath's binding obligation. It is not itself the oath but the ritual confirmation of assent to it.
Common Language
Modern common usage (Wiktionary): Present participle and gerund of "kiss the book" — treated as a verbal phrase, not a defined term.
Historical common usage (Webster's 1913): No independent entry; understood through its component words as a descriptive phrase for a familiar religious or ceremonial gesture.
The gap here is narrow but real. In ordinary language, "kissing the book" reads as a simple physical description. In legal usage, the phrase is a term of art naming a recognized element of the formal oath-taking ceremony — one with consequences for the validity of the oath itself. Whether the ceremony was properly performed could, in earlier practice, bear directly on whether an oath was legally binding.
Why It Matters in Research
Researchers encountering this phrase in historical case records, deposition transcripts, ecclesiastical court records, or common law treatises should understand it as a procedural marker, not mere color. Its presence or absence in a record may signal whether an oath was administered according to strict form.
The phrase is almost entirely historical in modern American legal sources. Oath administration in U.S. courts no longer requires physical contact with a religious text — witnesses affirm or swear without the ceremony, and most jurisdictions explicitly permit affirmation as a complete substitute. A researcher reading a 17th-, 18th-, or early 19th-century English or American record and finding a challenge to testimony on grounds of improper oath-taking may find this term at the center of the dispute.
In English ecclesiastical and common law courts, the corporal oath (of which kissing the book was the defining gesture) was distinguished from the mere verbal oath. The corporality of the act was understood to engage the conscience more fully and to invoke divine sanction more directly. Bouvier points researchers toward Oughton's Ordo and Pothier's treatment of obligations and evidence — sources that situate the practice within its canonical and civil law context.
Be alert to the difference between English sources and American sources even from the same era. American courts, particularly after independence, showed more flexibility about oath ceremony, and some states early on recognized conscientious objection to the form. What was mandatory procedure in an English ecclesiastical court might be merely customary in a Massachusetts or Virginia court of the same period.
The phrase does not appear in modern American statutory or case law as an operative term. Researchers finding it in 20th-century or later sources should treat it as either historical quotation or archaism.
Historical Dictionary Support
Black's (1st and 2nd editions) are in full agreement, offering identical definitions: the ceremony of touching the lips to a Bible, described as the external symbol of the witness's acknowledgment of the oath's obligation. Both editions treat the phrase matter-of-factly, as a ceremony still recognizable enough to warrant a dictionary entry, but offer no procedural detail.
Bouvier goes further and is more useful for historical research. He identifies it as part of the "corporal oath," notes the canonical theory behind it (assent to the oath as imposed), acknowledges variation — the whole Bible, a portion, or a cross — and provides specific research trails: Oughton's Ordo Judiciorum, Pothier on obligations and evidence, and Junkin on oaths. Bouvier's entry also gestures toward comparative practice across countries, which is valuable when working with sources from civil law or mixed-law jurisdictions.
None of the historical dictionaries addresses the legal consequences of failure to perform the ceremony, the treatment of non-Christian witnesses (for whom kissing the Bible raised obvious difficulties), or the transition to affirmation. These gaps are significant. Researchers needing the full procedural picture of historical oath administration will need to go beyond the dictionary shelf to Oughton, Greenleaf on evidence, or Wigmore.
Jurisdictional Note
English practice required the ceremony as part of the corporal oath in both common law and ecclesiastical courts well into the modern period. American courts diverged earlier and more completely, with many states permitting or requiring accommodation for witnesses with religious objections to the form. The ceremony has no operative force in any current U.S. jurisdiction.