פירוש על קידושין 81:10

The rabbis use the verb “send her” in the verse concerning divorce to prove that one may appoint an agent. The “simple” meaning of this verse is that the man sends his wife out of his house. The first level of midrash is based on the choice of verb—“veshilah.” Since this is the same word used for an agent, the midrash takes it as a hint that a man may appoint an agent. The second level of the midrash is based on the “heh” at the end of the verb. In its literal meaning, the heh means “her” as in “he sends her.” But read another way, it could mean “she sends” which alludes to her ability to appoint an agent. Finally, the word is also used to derive the idea that an agent can appoint another agent. This final halakhah would allow for agents to pass their agency along, rather than travel long distances.