Gittin 6:2-3

Gittin 6:2

If a woman appoints an agent to receive a get for her, she needs two pairs of witnesses: one pair to confirm that that she appointed this person her agent and another pair to confirm that she received the get and tore it (which was the practice in some cases). The same two individuals can serve as witnesses for both things, or one of the first pair and one of the second pair with a different person. A betrothed girl or her father may receive her get. Rabbi Yehuda said that two people cannot both have unilateral authority. Therefore, in such a situation, the father receives the get. One who is not able to guard her get (i.e., a minor) cannot be divorced.

Gittin 6:3

If a minor girl appointed an agent to accept her get for her, it is not effective until it is in her hand. Therefore, if her husband wants to cancel the job while the get is in the agent’s hand, he may do so. This is because a minor cannot appoint an agent. If the girl’s father appointed an agent to accept her get, then the husband cannot cancel the job once the agent has received it. If a man instructs an agent to deliver a get to his wife in a particular place and he delivered it elsewhere, it is invalid. If he told the agent that his wife could be found in a particular place and he gave it to her elsewhere, it is valid. If a woman instructs an agent to accept her get in a particular place and he accepted it elsewhere, it is invalid, though Rabbi Eliezer says it is valid. If she tells an agent to bring her get from a particular place but he brings it from elsewhere, it is valid.