Rashi on Exodus 14:15/רש"י על שמות י״ד:ט״ו

1מה תצעק אלי WHEREFORE CRIEST THOU UNTO ME? — there is no mention that he prayed to God concerning this, but this teaches us that Moses stood in prayer. Whereupon the Holy One, blessed be He, said to him, “It is no time now to pray at length, when Israel is placed in trouble”. Another explanation of מה תצעק אלי (taking it in the sense of “Wherefore criest thou? אלי it is to Me — concerns Me”) — upon Me rests this matter and not upon thee. The idea contained in this explanation is similar to what is expressed elsewhere: (Isaiah 45:11) “Concerning My sons and concerning the work of My hands will ye command Me?” (Mekhilta)

2דבר אל בני ישראל ויסעו SPEAK UNTO THE CHILDREN OF ISRAEL THAT THEY JOURNEY ONWARDS — There is nothing for them to do but to journey on, for the sea will not stand in their way: their ancestors’ merits and their own, and the faith that they placed in Me so that they left Egypt will suffice to divide the sea for them (cf. Mekhilta; Shemot Rabbah 21:8).