[If] one says: “Write a get and give [it] to my wife,” “Divorce her,” [or] “Write a letter and give [it] to her,” they may write and give [it]. [If he said:] “Release her,” “Provide for her,” “Do for her as is customary,” [or] “Do for her as is proper,” he did not say anything.  Originally, they said: [If] one goes out in chains and says: “Write a get for my wife,” they write and give [it]. They later said: Also one who sets out [to sea] and one who leaves in a caravan. R' Shimon Shezuri says: Also one who is endangered.