Moses
Exodus 15:14ESV·traditional attribution

The peoples have heard; they tremble; pangs have seized the inhabitants of Philistia.

John Calvin Reformed @genevareformer

14. The people shall hear. Again in this place I have not scrupled to change the tenses; for it is plain that Moses is speaking of things future; although I do not deny, that by verbs of the past tense he confirms the certainty of the matter; which is a common figure with the Prophets.

Matthew Henry Presbyterian @wholebiblehenry

Having read how that complete victory of Israel over the Egyptians was obtained, here we are told how it was celebrated; those that were to hold their peace while the deliverance was in working (Exo 14:14) must not hold their peace now that it was wrought; the less they had to do then the more they had to do now.

Commenting on Exodus 15:1-21

John Gill Reformed Baptist @doctorgill

And the people shall hear, and be afraid,.... What follows from hence to the end of the song is plainly prophetic, a prediction of future events; and this clause respects the case of all the nations of the earth, who should hear the report of the plagues, brought upon the Egyptians for the sake of Israel, and of their being brought out of Egypt, and...