Reference for Sotah 40:15
רבי ישמעאל אומר שנים עשר חדש ואע"פ שאין ראיה לדבר זכר לדבר דכתיב (דניאל ד, כד) להן מלכא מלכי ישפר עליך וחטיך בצדקה פרוק ועויתך במיחן ענין
But it has been taught: One who is defiled through contact with a corpse is permitted to enter the camp of the Levites; and not only did they say this of one who is defiled through contact with a corpse but even the corpse itself [may be taken there], as it is said: And Moses took the bones of Joseph with him<span class="x" onmousemove="('comment',' Ex. XIII, 19. ');"><sup>14</sup></span> — 'with him', i.e., in his division!<span class="x" onmousemove="('comment',' Which was the camp of the Levites. ');"><sup>15</sup></span> — Abaye said: [The reason is] lest she become menstruant.<span class="x" onmousemove="('comment',' As the result of her agitation. ');"><sup>16</sup></span> Is this to say that a sudden fright brings on [menstruation]? — Yes, for it is written: And the queen was exceedingly grieved,<span class="x" onmousemove="('comment',' Est. IV, 4. ');"><sup>17</sup></span> and Rab said, [It means] that she became menstruant. But we have learnt: Trembling holds back [the menstrual] flow! — Fear holds it back but a sudden fright brings It on. IF SHE POSSESSED A MERIT etc. Whose teaching is our Mishnah? It is not that of Abba Jose b. Hanan, nor of R. Eleazar b. Isaac of Kefar Darom, nor of R. Ishmael; for it has been taught: If she possess a merit, it suspends [the effect of the water] for three months, sufficiently long for pregnancy to be recognisable. Such is the statement of Abba Jose b. Hanan; R. Eleazar b. Isaac of Kefar Darom says: For nine months, as it is stated: Then she shall be free and shall conceive seed,<span class="x" onmousemove="('comment',' Num. V, 28. ');"><sup>18</sup></span> and elsewhere it declares, A seed shall serve him, it shall be related<span class="x" onmousemove="('comment',' Ps. XXII, 31. ');"><sup>19</sup></span> — i.e., a seed which is fit to be related.<span class="x" onmousemove="('comment',' Viz., at birth, and so the period of nine months is required. Rashi explains differently. ');"><sup>20</sup></span> R. Ishmael says: For twelve months, and although there is no proof of this, yet there is some indication; because it is written, Wherefore, O king, let my counsel be acceptable unto thee, and break off thy sins by righteousness, and thine iniquities by showing mercy to the poor,'