Beis Shamai: A shaliach sent to betroth (or return money of a borrower) cannot be a witness to the betrothal. (Beis Hillel say that he can become a witness.)

Question: What is the case?

Answer: If the husband sent two witnesses in addition to the shaliach, Beis Shamai say that he must inform them that one will be the shaliach and two will be the witnesses. Beis Hillel say that all three can be shaliachs and also witnesses.

R. Avun bar Chiya: These words apply when he betrothed with a document, but if he betrothed with money, he is personally involved in the case (and cannot testify that the money was given).

R. Yosi disagrees: Since the Torah believed him to become a shaliach, even if he betrothed with money, he is not considered to be personally involved.

R. Ba: Such a case was brought before Rav and he allowed the shaliach to testify.

A person once deposited a barrel of wine in the enclosure of his friend by sending it there with a carrier. The recipient later claimed that he did not receive it.

R. Pinchas: The case was brought before R. Yiirmiyah and he allowed the shaliach to testify, thereby obligating the carrier to make an oath.