Reference for Gittin 173:21

וליתכשר האי בראובן בן וליתכשר האי ביעקב עד דהא תנן איש פלוני עד כשר

[under it] seeing that we have learnt, 'The signature "son of So-and-so, witness" [renders a document] valid'? — We suppose that he writes 'Reuben son of' under the first Get and 'Jacob witness' under the second. But cannot the first be rendered valid by 'Reuben son of' and the second by 'Jacob witness', since we have learnt, 'The subscription, "So-and-so witness" [renders the document] valid'? — We suppose he did not add 'witness'. Or alternatively I may say that he does add 'witness', but we know that this is not the signature of Jacob.<span class="x" onmousemove="('comment',' But of his son. ');">¹⁹</span>

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