Albert Barnes' Notes on the Whole Bible - Exodus 4:20
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.” read more
The Pulpit Commentary - Exodus 4:20
His sons . Gershom, already mentioned ( Exodus 2:22 ), and Eliezer ( Exodus 18:4 ), who was probably an infant. Set them upon an ass . Literally, "the ass," i.e . the one ass that belonged to him. The word might best be translated " his ass." When Moses is said to have "set them upon" the animal, we need not understand "all of them." Probably Zipporah and her baby rode, while Gershom walked with his father. Though horses were known in Egypt before this, they could not be used in... read more