Interpolations

An interpolation is material present in some manuscripts but absent from the earliest and strongest witnesses, and judged by textual critics not to belong to the earliest recoverable text.

Several well-known passages fall into this category, including the last twelve verses of Mark, the woman caught in adultery, and the one verse in the King James New Testament that states the Trinity outright. Most modern Bibles bracket or footnote them for this reason.

The main cases#

The ending of Mark#

Mark's earliest recoverable text ends at 16:8, with the women fleeing the empty tomb and saying nothing to anyone.

Three endings survive in the manuscript tradition: no ending beyond 16:8, a "shorter ending" of a few lines, and the familiar twelve verses. Some manuscripts contain both the shorter and longer endings together, which indicates scribes were aware of a problem and uncertain how to resolve it.

The longer ending contains seventeen words appearing nowhere else in Mark, and the transition at verse 9 reintroduces Mary Magdalene as though she had not already been named in verse 1. Eusebius and Jerome both report that the passage was absent from most Greek copies known to them.

This is the passage containing the promise that believers "will pick up serpents with their hands, and if they drink any deadly poison, it will not hurt them."

The woman caught in adultery#

Absent from every Greek manuscript before the ninth century, including the two best fourth-century codices and two substantial papyri from around 200.

Where it does appear, its position varies: after John 7:36, after 7:44, after 7:52, at the end of John, or in Luke after 21:38. A passage that migrates between two different Gospels is not being copied from a fixed place in either.

Its vocabulary differs from the rest of John. No Greek commentator refers to it before the twelfth century, though Latin writers know it from the fourth.

Most textual critics regard the story as ancient — possibly a genuine early tradition about Jesus — while holding that it was not part of John's Gospel.

The Johannine Comma#

The King James Version of 1 John 5:7-8 reads: "there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one." This is the only verse in the Bible stating the doctrine of the Trinity explicitly.

The patristic silence is the strongest evidence. The verse would have settled the disputes at Nicaea and Constantinople outright, and no participant cites it.

Erasmus omitted it from his first two editions. After objections, he included it in his third, which fed the textual tradition behind the King James Version. Nearly all modern translations omit it or relegate it to a footnote.

Common objections#

"These passages have been in the Bible for centuries — they are scripture"

A defensible position on its own terms. A text used, preached, and treated as authoritative for well over a thousand years has a claim on a tradition regardless of when it entered.

That is a theological argument about canon rather than a historical one about origin, and the two questions are separate. The historical evidence about when these passages entered the manuscript tradition is not in serious dispute among textual critics of any confessional background.

"The King James Version is based on the manuscripts the church actually used"

Correct as a description. The Textus Receptus reflects the Byzantine tradition, which was the text of the Greek church for most of its history and rests on far more manuscripts than the Alexandrian text.

Manuscript count is a weak guide to age. The Byzantine manuscripts are numerous because they were copied in the medieval period, when the Greek-speaking church was concentrated in Byzantium; the Alexandrian witnesses are fewer but several centuries older.

In the specific case of the Comma, the Byzantine Greek tradition does not support it either. It entered through Latin.

"If scribes added things, the whole text is unreliable"

This overstates what the evidence supports, and it is not the conclusion textual critics draw.

These passages are identifiable precisely because the manuscript tradition is rich enough to expose them. Comparing thousands of witnesses is what makes a late addition visible, and the method works.

For most of the New Testament the wording is well established. The identified interpolations are a small set, and they are marked in modern editions rather than hidden.

"No doctrine depends on any of these passages"

Broadly correct, and stated by scholars across the spectrum. The Trinity is supported by other passages, so removing 1 John 5:7 does not remove the doctrine.

What it does show is how a doctrinal statement could enter the text. The Comma states the doctrine more plainly than any authentic verse, and it was cited as proof of it for centuries before its absence from the Greek manuscripts was widely acknowledged.

Snake handling as a religious practice rests substantially on Mark 16:18, which is in the disputed ending.

What the evidence shows#

A small number of familiar passages are absent from the earliest and best manuscripts and were added later. This is not a contested claim; it is recorded in the footnotes of most modern Bibles and in the standard critical editions.

The more general point concerns what is not visible. These additions are detectable because manuscripts survive from before and after they were made. For the period between composition and the earliest surviving copies — a gap of a century or more for most books — no such comparison is possible, and the manuscript record gives no reason to assume that interval was free of similar changes.

The evidence supports a text that was copied by hand, changed in identifiable ways, and can be reconstructed with confidence for most passages but not with certainty for all.