Commentary for Kiddushin 58:7
מהו דתימא נילף בכור בכור מנחלה מה להלן ראשית אונו אף כאן ראשית אונו קמ"ל:
- I might have argued, Let us learn the meaning of 'firstborn' here from inheritance.<span class="x" onmousemove="('comment',' Here, as stated; inheritance: Deut. XXI, 17: Bur he shall acknowledge . . the firstborn, by giving him a double portion of all that he hath; for he is the beginning of his strength.');"><sup>9</sup></span> Just as there, the beginning of his strength [is meant], so here too;<span class="x" onmousemove="('comment',' I.e., his own firstborn.');"><sup>10</sup></span> therefore we are informed [that it is not so].'
Daf Shevui to Kiddushin
When it comes to redeeming the first born, the first born is determined by the mother. So if a man has five sons from five different wives, he must redeem them all. But when it comes to inheritance, it follows the father. Only his own first born son inherits a double portion.
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