Yosef Karo, Shulchan Aruch — Choshen Mishpat 44
“ Paragraph 9- Nowadays, we have the custom to write the verification of erasures and hanging letters after “and they have made a kinyan” because today the practice is for all documents to say “affirmed and verified” so it is impossible to forge, we deduce from the last line and we do not need to review the content of the document on the last line. Thus, a document that does not say “affirmed and verified” would be invalid. Witnesses should not sign a document unless it says “affirmed and verified.” ”
