Why does it say "due to the flood water"?
Rashi: Noach had little faith. He did not enter the Ark until the Flood began. 1
Moshav Zekenim: This is like Seder Olam. However, a Midrash says that he entered a week earlier, before Mesushelach died.
QUESTIONS ON RASHI
Rashi writes: "They were forbidden in marital relations." What is the source for this in the Pasuk?
Gur Aryeh: The verse could have stated "and Noach and his wife came...," like the verse when they emerged from the Teivah, "Leave the Teivah, you and your wife..." (Bereishis 8:16). 1
Rashi writes: "They were forbidden in marital relations, for the world was in distress." Did we not learn this above (Rashi 6:18)? Also, earlier, Rashi did not give a reason for this prohibition.
Gur Aryeh: Refer to 6:18:2.1:1. Our verse teaches that the true reason for the prohibition (6:18) was that the world was in distress, therefore it applied even on the Teivah during the Mabul.