He took 600 of the best chariots, and all the other chariots of Egypt, with officers over all of them.
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
And he took six hundred chosen chariots,.... The chief and best he had, war chariots, chariots of iron; perhaps such as had iron scythes to them, to cut down men as they drove along; these were taken partly for quickness of dispatch, that they might be able the sooner to overtake the Israelites, who had got several days' marches before them; and partly for their...
And he took six hundred chosen chariots, and all the chariots of Egypt, and captains over every one of them. (d) Josephus writes that besides those chariots, there were 50,000 horsemen, and 80,000 footmen.