Reference for Yevamot 128:4
אמר רבה ליתנהו להני כללי מכדי מתני' מאן תקין רבי והא בימי דוד אימעוט שני דכתיב (תהלים צ, י) ימי שנותינו בהם שבעים שנה
Rabbah stated in the name of R. Nahman: Three years [must elapse],<span class="x" onmousemove="('comment',' Before the husband must take another wife. ');"><sup>9</sup></span> corresponding to three remembrances;<span class="x" onmousemove="('comment',' Three Rosh Hashanah festivals. The first two days of the new year are a time of prayer on which God remembers the childless women. The festival is also known as the Day of Memorial [H] ');"><sup>10</sup></span> For a Master said: Sarah, Rachel and Hannah<span class="x" onmousemove="('comment',' Who were originally barren. (Cf. Gen. XI, 30, XXIX, 31, I Sam. I, 2, 5). ');"><sup>11</sup></span>