Latest / Matmonim: Daf Yomi by Rabbi David Lapin
Bechorot 51a-b Giving and Receiving - המפריש פדיון בנו ואבד
Bechor adam (human first born) is different from all other gifts that we have to give to the Kohen. In the case of the bechor adam, the mitzva of redemption is only fulfilled when the kohein receives the 5 sela’im from the father. The father compensates the beit hamikdash for the “loss” of his bechor.
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