(Exodus 14:31) "and the people feared the L–rd": In the past they had not feared the L–rd, but here, "and the people feared the L–rd." "and they believed in the L–rd and in Moses, His servant": If they believed in Moses, how much more so, in the L–rd! (i.e., Why need this be written?) We are hereby apprised that one who believes in the "faithful shepherd" believes in the pronouncement (i.e., the Torah) of Him who spoke and brought the world into being.
Why Does the Verse Mention Belief in Moses Separately
Mekhilta Tractate Vayehi Beshalach 7:18