Reference for Bekhorot 60:34

הבא לקבל דברי חבירות צריך לקבל בפני שלשה חבירים ובניו ובני ביתו אינן צריכין לקבל בפני שלשה חבירים

Our Rabbis taught: One who desires to accept the obligations of a haber is required to do so in the presence of three haberim, whereas his sons and the members of his family are not required to accept [these obligations] in the presence of three haberim.

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