Exodus 9:20

He that feared. For the first time an intimation is made that there were Egyptians who had learned to fear the Lord. Apparently the effect of the plagues had gradually convinced many of them that the God of the Hebrews was indeed a powerful God. They probably did not yet know Him as the only true God, but only as One whom it was advantageous to respect and propitiate. At the Exodus a “mixed multitude,” apparently not Hebrews themselves (cf. Num. 11:4), left Egypt with the departing slaves (Ex. 12:38). As a result of the plagues many Egyptians must have come to the conclusion that it would be to their advantage to join the despised Hebrews and benefit by at least nominal allegiance to their God. Here, at the time of the seventh plague, is the first indication of dissension among the Egyptians, who seem thus far to have been united in their opposition to the Israelites. Some of the “servants [officials] of Pharaoh” profited by the warning given by Moses (ch. 9:19) and housed their cattle and herdsmen in anticipation of the coming storm.