Having presented Hashem's victory over Pharaoh and his army (refer to 15:4:1:1*), what is the Torah discussing now?
What does the Torah mean when it writes, "uv'Ru'ach Apecha"?
Rashi: The Torah sometimes speaks about Hashem in human term (a language that we understand) - and when a persson becomes angry, he breaths hot air from his nostrils, 1 which comes out in short spurts. 2
Rashbam: It refers to the powerful east wind that caused the water to pile up. 3
Da'as Zekenim: Normally, breath from the mouth is cold, and from the nose is hot. Here was a double miracle - His [hot] breath from the nose froze the water, and His [cold] breath from the mouth melted the frozen water.
Kol Eliyahu: Just like Hashem 'breathed' into Adam, and this gave him Chochmah, likewise the water received Chochmah 4 - like Targum Onkelos explains.
See for example, Tehilim 18:9, and Iyov 4:9 (Rashi).
Rashi: This explains why the Pasuk always refers to anger with a Lashon "Charon Af" or just "Charah" (which means hot (burning)). See Rashi, who dwells at length on this point.
See above, 14:22.
Aderes Eliyahu: Pharaoh was afraid of the water, which froze, so he would think that he has a secure path to catch Yisrael.
What is the meaning of "Ne'ermu Mayim"?
Rashi #1 (citing Targum Onkelos): It means that, by the command of Hashem 1 the water became wise. 2
Rashi #2, Seforno, Rashbam and Targum Yonasan: It means that the water piled up into a heap. 3
Hadar Zekenim: It means that the water was able to sing Shirah.
What are the connotations of "Kafe'u Tehomos b'Lev Yam"?
Rashi, Rashbam and Seforno: The sea-bed congealed. 1 It became hard like stone, and the water proceeded to hurl the Egyptians on to it (Rashi), 2 or to enable Yisrael to cross without difficulty (Seforno).
Rosh (14:26): Just like a person's heart is a third (below the top of his height), also the heart of the sea. The top third split, and below that congealed. 3 Da'as Zekenim adds, that had all the water split down to the Tehom (the sea floor), Bnei Yisrael would not have been able to come up. 4
Rashi and Rashbam: Like cheese - see Iyov 10:10.
Rosh: Parshas Tzitzis was written about Yetzi'as Mitzrayim (it is mentioned at the end; also refer to 14:5:154:1,2), therefore Chazal said (Menachos 39a) to make the threads a third windings, and the rest straight.
Because the slope would have been too steep (PF).