For the source text click/tap here: Nazir 12
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Our Gemara presents the case of a man who appointed a messenger to arrange a marriage on his behalf. Rabbi Yohanan rules that if he gave no instructions, we must assume that his messenger did his bidding and that he is now married to someone. In the event that the messenger does not return and we do not know to whom the man is married, we are forced to conclude that the man cannot marry anyone, since she might be an immediate relative (a sister, daughter, mother, etc.) of the woman to whom he is married.
We explore the role of aprotropos or fiduciary in bible (Eliezer) and in Jewish/Roman law