Reference for Shevuot 35:4
אמר רבא ותרוייהו תנינהו כניסה תנינא פרישה תנינא פרישה תנינא דקתני היה משמש עם הטהורה ואמרה לו נטמאתי ופירש מיד חייב
and not a learned man for that.<span class="x" onmousemove="('comment',' Not knowing that he must not withdraw immediately, he thus brings two, one for entering, and one for withdrawing. This is not the same as eating two portions of prohibited fat in one spell of unawareness (for which he brings only one sin offering) for, when she told him she had become unclean, he was immediately aware that he had committed a sin; for, being learned, he knew that he ought not to have cohabited with her near her period.');"><sup>7</sup></span> Raba said: And both [these laws] we have learnt: Entering, we have learnt; and withdrawing, we have learnt.' Withdrawing, we have learnt' - for it states, IF ONE COHABITED WITH A CLEAN WOMAN, AND SHE SAID TO HIM: 'I HAVE BECOME UNCLEAN!', AND HE WITHDREW IMMEDIATELY, HE IS LIABLE.'