Commentary for Kiddushin 156:13
ולרבי מאיר דאמר אדם מקנה דבר שלא בא לעולם יכיר למה לי שנפלו לו כשהוא גוסס
In respect of what [is he believed]? to give him a double portion?<span class="x" onmousemove="('comment',' Deut. XXI, 17,');"><sup>20</sup></span> That is obvious, and what is the need of a verse; for if he desired to make him a gift, could he not do so? - This refers to property which he [the father] inherits [only] subsequently.<span class="x" onmousemove="('comment',' Lit., 'which falls to him afterwards', i.e., after declaring that this is his firstborn. - Now, when he declares thus, he cannot gift this legacy, which, as far as he is concerned, is non-existent; and yet he is believed in respect of a double portion for the son recognised by him as his firstborn.');"><sup>21</sup></span>
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