(Ibid. 11) "Now I know that greater is the L–rd than all the gods": Until now he had not conceded anything to Him. "that the L–rd is greater": They said: In the beginning there was no slave that could escape from Egypt, it being entirely sealed off, and now He has taken six hundred thousand men out of Egypt!
Yithro Had Not Conceded Anything to God of Israel
Mekhilta Tractate Amalek 3:41