(Exodus 14:7) "And he took six hundred choice chariots": Whence came the horses required for the chariots? If you would say, from Egypt, is it not written (re the plague of pestilence, Ibid. 9:6) "and all the cattle of Egypt died"? And if you would say, from Pharaoh, is it not written (Ibid. 3) "Behold, the hand of the L–rd is in your cattle in the field, in the horses, etc."? And if you say, from Israel, is it not written (Ibid. 10:26) "And our cattle, too, will go with us; not a hoof will remain"? Whence, then, did they come? From those (of his servants) who feared the word of the L–rd (viz. 9:20) and drove his horses from the field into the houses. We find, then, that the cattle driven off by those who feared the word of the L–rd proved to be an impediment to Israel—whence R. Shimon says: "the best of the gentiles—kill! The best of the serpents—crush its head!"