Gittin 88A

הכא נמי ⁠– כשיש ריוח מלמעלה.

so too, it is a case where there is space above the latter one, so it is clearly not a separate bill of divorce that was cut.

ודלמא אימלוכי אימליך (וכתב)!

The Talmud asks: But although it is clearly one bill of divorce, perhaps the scribe wrote the first part of the bill of divorce and then the husband changed his mind about divorcing his wife, thereby canceling the bill of divorce, and afterward he changed his mind again and the scribe then wrote the rest of the bill of divorce in the second column, after the first part was already canceled.

דכתיב ״הרי את״ מלמטה, ו״מותרת״ מלמעלה. ודלמא איתרמי ליה? כולי האי לא חיישינן.

The Talmud answers: It is a case where he wrote: You are hereby, on the bottom of the first column, and continued: Permitted to marry any man, at the top of the second column. In this case there is obvious continuity between the columns, and he certainly did not change his mind in the meantime. The Talmud asks: But perhaps it happened that he stopped in the middle of the sentence? The Talmud answers: We are not concerned to such a degree; it is highly unlikely that he changed his mind in the middle of a sentence.

רב אשי אמר: דידיעה ביה מתחתא דמגילתא.

Rav Ashi said: The Mishnah is referring to a case where the stretch of the scroll is clear, so it is obvious that it is a complete piece of parchment and that nothing was cut out of it.

חתמו עדים בראש הדף וכו׳. איני?! והא רב חתים מן הצד! התם בשגגו כלפי כתב.

§ It is stated in the Mishnah: If the witnesses signed at the top of the column or on the side, the bill of divorce is invalid. The Talmud raises an objection: Is that so? Wouldn’t Rav sign on the side? The Talmud answers: There, in the case of Rav, he would sign with the roof, i.e., the top, of his signature facing the text of the document, so it was clear that he was signing the document.