וָאֶקַּח֙ אֶת־הַלְוִיִּ֔ם תַּ֥חַת כָּל־בְּכ֖וֹר בִּבְנֵ֥י יִשְׂרָאֵֽל׃
이러므로 내가 이스라엘 자손 중 모든 처음 난 자의 대신으로 레위인을 취하였느니라
Chizkuni
צא מן התיבה אתה ואשתך, “leave the ark, you and your wife, etc;” when you check the text you will find that Noach did not follow G-d’s instructions precisely, as in verse 18 the Torah reports that Noach did not leave the ark at the same time as his wife, but he left in the company of his sons. According to an argument between Rabbi Nechemyah and Rabbi Yehudah, according to one Noach was punished for not taking advantage of living with his wife again immediately and siring more children by being debased and castrated in his wife’s tent. (Bereshit Rabbah 35,1) The other Rabbi disagrees, claiming that he was rewarded, seeing that he proved more chaste than even commanded, by not immediately indulging in sex with his wife so that G-d spoke to both him and his children in 9,1.