Rashi on Exodus 4:4/רש"י על שמות ד׳:ד׳

1ויחזק בו AND HE LAID HOLD OF IT —The phrase signifies “grasping” (אחז). There are many examples of it in the Scriptures: (Genesis 19:16) “The men laid hold of (ויחזיקו בְּ..) his hand”; (Deuteronomy 25:11) “And she layeth hold of (והחזיקה בְּ..) his secret parts”; (I Samuel 17:35) “And I caught him by (והחזקתי בְּ..) his beard”. [Wherever the root חזק in the Hiphil is followed by the preposition ב it denotes “taking hold of a thing”].