Reference for Yevamot 48:7
אי הכי לכתחלה נמי משום דרב אסי דאמר רב אסי (משלי ד, כד) הסר ממך עקשות פה ולזות שפתים וגו'
Our Rabbis learnt: No proselytes will be accepted in the days of the Messiah.<span class="x" onmousemove="('comment',' When Israel will be Prosperous and Prospective proselytes will be attracted by worldly considerations. ');"><sup>24</sup></span> In the same manner no proselytes were accepted in the days of David nor in the days of Solomon.<span class="x" onmousemove="('comment',' During Israel's heyday. V. previous note. ');"><sup>25</sup></span> Said R. Eleazar: What Scriptural [support is there for this view]? — Behold he shall be a proselyte who is converted for my own sake,'<span class="x" onmousemove="('comment',' Or who is converted while I am not with you (v. Rashi, a.l.) i.e., while Israel is in exile and forsaken by God. ');"><sup>26</sup></span> he who lives with you shall be settled among you,<span class="x" onmousemove="('comment',' Isa. LIV, 15, according to the Midrashic interpretation of R. Eleazar. The rt. [H] which E.V. renders 'to gather' is here interpreted 'to become a proselyte', 'to be converted'. ');"><sup>27</sup></span>