Yahweh hardened the heart of Pharaoh king of Egypt, and he pursued after the children of Israel; for the children of Israel went out with a high hand.
We have here, I. Instructions given to Moses concerning Israel's motions and encampments, which were so very surprising that if Moses had not express orders about them before they would scarcely have been persuaded to follow the pillar of cloud and fire. That therefore there might be no scruple nor dissatisfaction about it, Moses is told before, 1. Whither they must go, Exo 14:1, Exo 14:2.
Commenting on Exodus 14:1-9
Exo 14:4-9 When it was announced that Israel had fled, “the heart of Pharaoh and his servants turned against the people,” and they repented that they had let them go. When and whence the information came, we are not told. The common opinion, that it was brought after the Israelites changed their route, has no foundation in the text.
Commenting on Exodus 14:4-9
8. And the children of Israel went out. Exierant. — Dathe. Moses indirectly reproves their too great security, which had freed them altogether from care and fear; and whence even the desire of calling on God had grown cold in them, as security always produces drowsiness and an idle spirit. Hence it came to pass, that this great danger, which they had not expected. produced the greater fear.