John Gill Commentary Exodus 9:20

"He that feared the word of Jehovah among the servants of Pharaoh made his servants and his cattle flee into the houses." — Exodus 9:20 (ASV)

He that feared the word of the Lord among the servants of
Pharaoh
Who, if they had not the true fear of God, and were not sincere proselytes, yet had a servile fear of him, and dreaded his word, his threatening, his denunciations of judgments and predictions of future punishments; of which they had had many instances wherein they were fulfilled, and therefore had reason to fear that this also would, even the word that had been just now spoken: made his servants and cattle flee into the houses ;
called home his servants, and drove his cattle in great haste out of the fields, and brought them home as fast as he could, and housed them; in which he acted the wise and prudent part, and showed a concern for his servants and his cattle, as well as believed the word of the Lord.