Gittin 19A

כדאי הוא רבי שמעון לסמוך עליו בשעת הדחק.

R' Shimon, who permitted using a bill of divorce that was written during the day and signed at night, is worthy of being relied upon in exigent circumstances. Therefore, once such a bill of divorce has been written and given, the woman is divorced.

והאמר ריש לקיש: לא הכשיר רבי שמעון אלא לאלתר, אבל מכאן ועד עשרה ימים ⁠– לא! בההיא, כרבי יוחנן סבירא ליה.

The Talmud challenges: But didn’t Reish Lakish say: R' Shimon deemed such a bill of divorce valid only if it was signed immediately, but after a delay from now until 10 days, no. The Talmud answers: With regard to that question, whether the others must sign immediately, R' Yehoshua ben Levi holds in accordance with the opinion of R' Yoḥanan, who holds that they may sign after a delay.

והאמר רבי יוחנן: שנים משום עדים, וכולן משום תנאי! בההיא, כריש לקיש סבירא ליה.

The Talmud challenges: But didn’t R' Yoḥanan say: Two of them function as witnesses, and all the rest of them sign the bill of divorce only due to the stipulation? It is clear that R' Yehoshua ben Levi does not hold in accordance with the opinion of R' Yoḥanan, as R' Yehoshua ben Levi is concerned about the other witnesses and deems the bill of divorce valid only due to exigent circumstances. The Talmud answers: With regard to this, i.e., why the additional people must sign, he holds in accordance with the opinion of Reish Lakish that all of them function as witnesses.

מתני׳ בכל כותבים ⁠– בדיו, בסם, בסיקרא, ובקומוס, ובקנקנתום, ובכל דבר שהוא של קיימא. אין כותבין לא במשקין, ולא במי פירות, ולא בכל דבר שאינו מתקיים.

Mishnah: One may write a bill of divorce with any material that can be used for writing: With deyo, with paint [sam], with sikra, with komos, with kankantom or with anything that produces permanent writing. However, one may not write with other liquids, nor with fruit juice, nor with anything that does not produce permanent writing.