Amanuensis
An amanuensis is a scribe who writes at another person's dictation. The biblical witness shows the practice in two extended settings: Baruch taking down Jeremiah's oracles, and the apostles dictating their letters while signing key portions in their own hand.
Baruch and the Dictated Scroll
The clearest Old Testament case is Baruch the son of Neriah, who serves Jeremiah through several prophetic seasons: "Then Jeremiah called Baruch the son of Neriah; and Baruch wrote from the mouth of Jeremiah all the words of Yahweh, which he had spoken to him, on a roll of a book" (Jer 36:4). The role is named again as the scroll is delivered to a later word: "The word that Jeremiah the prophet spoke to Baruch the son of Neriah, when he wrote these words in a book at the mouth of Jeremiah, in the fourth year of Jehoiakim" (Jer 45:1).
When Jehoiakim cuts and burns the first scroll, the dictation simply resumes: "Then Jeremiah took another roll, and gave it to Baruch the scribe, the son of Neriah, who wrote in it from the mouth of Jeremiah all the words of the book which Jehoiakim king of Judah had burned in the fire; and there were added besides to them many like words" (Jer 36:32). Baruch is "the scribe," but the words are Jeremiah's; the prophetic content and the scribal hand are kept distinct in the narration.
Tertius and the Letter to Rome
Romans carries an explicit self-identification by the writing scribe inside the closing greetings: "I Tertius, who write the letter, greet you⁺ in the Lord" (Rom 16:22). The letter is Paul's, but the hand putting it on the page is Tertius's, named in passing as the dictation-and-greeting reaches its end.
Paul's Own-Hand Signature
Several Pauline letters mark the moment when Paul takes the pen back from a scribe to write the closing greeting himself. The pattern is consistent: "The salutation of me Paul with my own hand" (1Co 16:21). At the end of Galatians: "See with how large letters I write to you⁺ with my own hand" (Gal 6:11). At the end of Colossians: "The salutation of me Paul with my own hand. Remember my bonds. Grace be with you⁺" (Col 4:18). At the end of 2 Thessalonians the practice is named as a deliberate authenticating token: "The salutation of me Paul with my own hand, which is the token in every letter: so I write" (2Th 3:17).
The same hand-shift carries a legal weight in Philemon, where Paul personally signs the promise to repay Onesimus's debt: "I Paul write it with my own hand, I will repay it: that I should not have to say to you that you owe to me even your own self besides" (Phm 1:19). The body of the letter has been carried by a scribe; the bond clause is in Paul's own writing.
Silvanus and the Petrine Letter
Peter names his scribe at the close of his first letter: "By Silvanus, our faithful brother, as I account [him], I have written to you⁺ briefly, exhorting, and testifying that this is the true grace of God: stand⁺ fast in it" (1Pe 5:12). The construction is the same as in the Pauline pattern — the apostle's voice, a named brother's hand.