Commentaries:
Barnes' Notes
An ass - Literally, "the ass," which, according to Hebrew idiom, means that he set them upon asses. This is the first notice of other sons besides Gershom.
The rod of God - The staff of Moses was consecrated by the miracle Exodus 4:2 and became "the rod of God."
Other Barnes' Notes entries containing Exodus 4:20:
Exodus 17:9
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