Reference for Bava Batra 222:1

אמר ליה לשמעיה גוד לית דין צבי למילף וטעמא מאי אמר אביי אמר קרא (דברים כא, יז) בכל אשר ימצא לו לו ולא לה

— He<span class="x" onmousemove="('comment',' R. Jannai. ');">¹</span> called to his attendant: Lead on! This [man] does not desire to learn.<span class="x" onmousemove="('comment',' He only wishes to argue. ');">²</span> What, then, is the reason?<span class="x" onmousemove="('comment',' Why, indeed, does a firstborn son take a double share in his father's, and not in his mother's estate? ');">³</span>

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