Reference for Bava Batra 260:1

מה תלמוד לומר (דברים כא, טז) לא יוכל לבכר

What [need was there for Scripture] to say, He may not make [the son of the beloved] the firstborn?<span class="x" onmousemove="('comment',' This law, surely, is specifically stated in Deut. XXI, 17, 'but he shall acknowledge he firstborn etc.'! ');">¹</span>

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