Biblical Unitarians concur with modern textual scholarship that John 7:53-8:11 (the Woman Caught in Adultery) is not part of the original Gospel of John. This passage is absent from the earliest and most reliable Greek manuscripts, including Papyrus 66, Papyrus 75, Codex Sinaiticus, Codex Vaticanus, and the Byzantine family of texts. Church fathers like Origen and Eusebius were unaware of it, and textual variants in its placement and content suggest it was a floating tradition eventually incorporated into later John manuscripts.

The passage also exhibits stylistic and vocabulary differences from the Fourth Gospel. While Biblical Unitarians do not regard the passage as theologically problematic (the story itself does not depend on Trinitarian assumptions), they affirm its non-canonical status as a matter of textual integrity and responsible biblical scholarship. The story's teaching on grace and forgiveness is valued in Christian tradition, but it is not part of the scriptural canon.