Commentary for Kiddushin 58:6
ת"ר מנין שאם היו לו חמשה בנים מחמש נשים שחייב לפדות כולן ת"ל כל בכור בניך תפדה פשיטא בפטר רחם תלא רחמנא
Our Rabbis taught: How do we know that if one has five [firstborn] sons by five wives, he is bound to redeem them all? From the verse: 'All the firstborn of thy sons thou shalt redeem.' But that is obvious, [since] the Divine Law made it dependent upon the opening of the womb?<span class="x" onmousemove="('comment',' Ibid. 19.');"><sup>8</sup></span>
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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