פּירוש אויף בראשית 7:7

נח ובניו NOAH AND HIS SONS — The men separately and the women separately, because they were forbidden to live together as man and wife since the world was living in a state of distress

מפני מי המבול, “on account of the waters of the deluge, and not on account of G-d’s command to enter the ark. [This is why the sages comment that even Noach was not a strong believer as he waited till necessity forced him to take refuge in the ark. Compare Rashi. Ed.]

ויבא נח, ובניו, ואשתו ונשי בניו, “Noach, his sons, and his wife and his sons’ wives, with him entered the ark;” Rashi, analysing the sequence in which Noach and his family entered the ark, explains that the men and women did so separately, realising that as long as the deluge would last they would not be allowed to have marital relations. (Based on an ancient version of the Tanchuma)

מפני מי המבול BECAUSE OF THE WATERS OF THE FLOOD — (מפני properly means ‘‘from before”) — Noah, also, was of those people who are wanting in faith: he believed and he did not believe that the Flood would come, and he would not enter the Ark until the waters forced him to do so (Genesis Rabbah 32:6).