Some tanaim teach that a person's shaliach is like the person himself and some teach that he is not like the person.

Beraisa #1: The pasuk states (Vayikra 27, 33), "And if he shall exchange it'' - (the double wording that teaches that a person cannot exchange the holiness of a sacrifice using a shaliach). Another pasuk states (Bamibar 30, 16), "If he shall annul (his wife's vows)'' - (the double wording does not allows one's shaliach to annul one's wife's vow).

One can assume here that usually a person's shaliach is like the person himself, unless a pasuk excludes it.

Another pasuk states (Vayikra 1, 4), "He shall rest his hand (on the sacrifice)'' - his hand but not his son's, his slave's, or his shaliach's hand.

One can assume here that usually a person's shaliach is like the person himself, unless a pasuk excludes it.

Another pasuk states (Shemos 21, 6), "...and his master shall bore into his ear with an awl'' - his master but not his master's son or shaliach.

One can assume here that usually a person's shaliach is like the person himself, unless a pasuk excludes it.

Beraisa #2: "He shall bore'' - this includes his shaliach. This is the opinion of R. Akiva, but R. Yishmael learns from the word "his master'' that as long as the master ordered it, it is valid.