הֵ֣ן גּ֥וֹר יָג֛וּר אֶ֖פֶס מֵֽאוֹתִ֑י מִי־גָ֥ר אִתָּ֖ךְ עָלַ֥יִךְ יִפּֽוֹל׃
看哪，沒有我同在的人必定驚懼害怕；凡聚集起來攻擊你的，必因你而仆倒。
Yevamot
The rabbis taught: Converts are not accepted in the messianic era; ... similarly, they did not accept them in the times of David and Solomon.