וַיָּ֣בֹא נֹ֗חַ וּ֠בָנָיו וְאִשְׁתּ֧וֹ וּנְשֵֽׁי־בָנָ֛יו אִתּ֖וֹ אֶל־הַתֵּבָ֑ה מִפְּנֵ֖י מֵ֥י הַמַּבּֽוּל׃
און נֹח, און זײַנע זין, און זײַן װײַב, און זײַנע זינס װײַבער, מיט אים, זײַנען אַרײַנגעגאַנגען אין דער תּבֿה, פֿון װעגן דעם װאַסער פֿון מבול.
Mesillat Yesharim
The writer says: I have composed this work not to teach people what they do not know but to remind them of what they already know and which is very familiar to them. For you will find in most of my words only things which most people already know and do not have any doubt about.
Shenei Luchot HaBerit
'ויאמר ה' לנח בא אתה וגו. We learn from here that a guest does not have the right to enter his host's home unless invited to do so. Even Noach did not want to enter the ark until G–d the owner asked him to. Only then does the Torah report that Noach entered the ark.