Reference for Moed Katan 36:13

אלא שמא יקדמנו אחר ברחמים

But [yet], could Samuel have said 'Lest another [rival suitor] anticipate him'? Surely Rab Judah, as citing Samuel, said: ['Forty days before the embryo is formed<span class="x" onmousemove="('comment',' V. D.S. note ad loc and cf. Sot. ');">²¹</span> an echo issues<span class="x" onmousemove="('comment',' Cur. edd. have here 'daily'.');">²²</span>

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