פירוש על גיטין 6:1

The scribe doesn't write, nor do the witnesses sign, until the husband says to them to write and sign. Rem"a: And ideally, he tells the scribe before the witnesses (Seder Haget of R' A Margoliot). And when the husband says it to them, they should write it themselves and not tell others to write and sign. Even if he says to the court, "Give a bill of divorce to my wife," they cannot tell a scribe to write and witnesses to sign. Even if he says to them, "Tell a scribe to write and witnesses to sign," a scribe cannot write and witnesses cannot sign until they hear it from his mouth. Rem"a: If he transgressed and divorced her by way of [telling the court] "Tell a scribe to write..." it is a legally unclear divorce (Tur in the name of the Ramah and the Beit Yosef in the name of the Ran, and the Baal Haterumah and Semag and the Mordechai and the Kol Bo).

If he says to ten people, "Write and sign and give a bill of divorce to my wife," one writes and two sign and one gives.

If he says, "All of you sign," or he assigns them, whether he assigns all of them or assigns some of them, and he says to them, "Sign it," it is as if he said to all of them to sign it, so all of them need to sign it. Two sign it first as the witnesses, and neither of them can be invalid [as witnesses on the bill of divorce], and the others [sign] as the condition. Therefore, if the rest of them are invalid, or one signs today and another signs tomorrow or after a few days, it is kosher, as long as each signs in front of the rest. Even if the rest sign after the giving of the bill of divorce, Rem"a: and even after she remarries (Ran First Perek of Gittin), , it is kosher. And if one of them dies before he signs it, the bill of divorce is void Rem"a: And see further down coming up.