1)
Why did He say "Im Lo Brisi Yomam va'Laylah"?
1.
Rashi: It cannot be that the Bris I made with day and night to be in their times will not be fulfilled. It is impossible for Chukos of Shamayim and Aretz to be Batel, as if I did not make them. Also Zera Yakov
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Rashi: This Midrash does not fit the order of the verses.