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."

His wife and his sons - Both Gershom and Eliezer, though the birth of the latter has not yet been mentioned in the Hebrew text. See Clarke's note on Exodus 2:22.

Set them upon an ass - The Septuagint reads the word in the plural, εκι τα ὑποζυγια, upon asses, as it certainly required more than one to carry Zipporah, Gershom, and Eliezer.

The rod of God - The sign of sovereign power, by which he was to perform all his miracles; once the badge of his shepherd's office, and now that by which he is to feed, rule, and protect his people Israel.

And Moses took his wife, and his sons,.... Gershom and Eliezer; by which it appears that he intended to stay in Egypt, and that he believed that God would work deliverance by him:

and set them upon an ass: which though with us a mean creature, yet in those times and countries were rode upon by great personages; and these, as Aben Ezra says, were reckoned in Egypt more honourable than mules. It may be the singular is put for the plural, and that each of them was set upon an ass, with servants to take care of them:

and he returned to the land of Egypt; that is, he set forward to go thither; for before he got thither, various things are related which befell him:

and Moses took the rod of God in his hand: his shepherd's staff, so called, because God ordered him to take it; and besides, he had wrought signs and wonders by it already, and would do many more.

Moses then set out upon his journey, with his wife and sons. בּניו is not to be altered into בּנו, as Knobel supposes, notwithstanding the fact that the birth of only one son has hitherto been mentioned (Exodus 2:22); for neither there, nor in this passage (Exodus 4:25), is he described as the only son. The wife and sons, who were still young, he placed upon the ass (the one taken for the purpose), whilst he himself went on foot with "the staff of God" - as the staff was called with which he was to perform the divine miracles (Exodus 4:17) - in his hand. Poor as his outward appearance might be, he had in his hand the staff before which the pride of Pharaoh and all his might would have to bow.

And Moses took his wife and his sons, and set them upon an ass, and he returned to the land of Egypt: and Moses took the {h} rod of God in his hand.

(h) By which he wrought the miracles.

4:20 The rod of God - His shepherd's crook so called, as it was God's instrument in so many glorious works.

20. Moses took his wife and his sons, and set them upon an ass-Septuagint, "asses." Those animals are not now used in the desert of Sinai except by the Arabs for short distances.

returned-entered on his journey towards Egypt.

he took the rod of God-so called from its being appropriated to His service, and because whatever miracles it might be employed in performing would be wrought not by its inherent properties, but by a divine power following on its use. (Compare Ac 3:12).

4:18-23 After God had appeared in the bush, he often spake to Moses. Pharaoh had hardened his own heart against the groans and cries of the oppressed Israelites; and now God, in the way of righteous judgment, hardens his heart against the teaching of the miracles, and the terror of the plagues. But whether Pharaoh will hear, or whether he will forbear, Moses must tell him, Thus saith the Lord. He must demand a discharge for Israel, Let my son go; not only my servant, whom thou hast no right to detain, but my son. It is my son that serves me, and therefore must be spared, must be pleaded for. In case of refusal I will slay thy son, even thy first-born. As men deal with God's people, let them expect so to be dealt with.