Reference for Bava Batra 222:5

אם כן לימא קרא כי הוא ראשית און מאי אונו שמע מינה תרתי

[from which it is to be inferred that the law applies to the first fruits of] his<span class="x" onmousemove="('comment',' The father's. ');">¹³</span> strength and not of her strength. [Surely] that [word]<span class="x" onmousemove="('comment',' [H] his strength. ');">¹⁴</span> is required for [the law that though one was] born after a miscarriage<span class="x" onmousemove="('comment',' Though he did not 'open the womb', and is not regarded as a firstborn son in respect of 'sanctification to the Lord' and 'redemption from the priest' (v. Ex. XIII, 2). ');">¹⁵</span>

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