Joshua - This is the first mention of the great follower and successor of Moses. He died at the age of 110, some 65 years after this transaction. His original name was Hosea, but Moses calls him by the full name, which was first given about forty years afterward, as that by which he was to be known to succeeding generations. From this it may perhaps be inferred that this portion of Exodus was written, or revised, toward the end of the sojourn in the wilderness.

The rod of God - See Exodus 4:20. The hill is supposed to be the height now called Feria an the north side of the plain Er Rahah; (or, Jebel Tahuneh over Feiran. Palmer).

Moses said unto Joshua - This is the first place in which Joshua the son of Nun is mentioned: the illustrious part which he took in Jewish affairs, till the settlement of his countrymen in the promised land, is well known. He was captain-general of the Hebrews under Moses; and on this great man's death he became his successor in the government. Joshua was at first called Hoshea, Numbers 13:16, and afterwards called Joshua by Moses. Both in the Septuagint and Greek Testament he is called Jesus: the name signifies Savior; and he is allowed to have been a very expressive type of our blessed Lord. He fought with and conquered the enemies of his people, brought them into the promised land, and divided it to them by lot. The parallel between him and the Savior of the world is too evident to require pointing out.

Top of the hill - Probably some part of Horeb or Sinai, to which they were then near.

And Moses said unto Joshua,.... The son of Nun, who was his minister, and was a man of war from his youth, trained up in the art of war, and afterwards succeeded Moses, and was captain of the armies of Israel, and fought at the head of them, and subdued the Canaanites. Moses knew he was a fit person for the present purpose, and therefore gave him the following orders:

choose us out men; the stoutest and most courageous, best able to bear arms, and engage in war; for the multitude in common was not qualified for such service, nor was there any necessity of engaging them all in it:

and go out; out of the camp, and meet them at some distance, that the women and children might not be terrified with the enemy:

fight with Amalek; for their cause was just, Amalek was the aggressor, Israel was on the defensive part; and should it be asked where they had arms to fight with, it may be remembered that the Egyptian army that was drowned in the Red sea, and whose bodies were cast upon the shore, might furnish them with a large quantity of armour, which they stripped them of, and arrayed themselves with:

tomorrow I will stand upon the top of the hill, with the rod of God in my hand: on the top of Mount Horeb or Sinai, where he might be seen by the army of Israel with that rod in his hand, lifted up as a banner, by which God had done so many wonderful things; and by which they might be encouraged to hope that victory would go on their side, and this he promised to do "tomorrow", the day following; for sooner a select body of men could not be taken out from the people, and accoutred for war, and go forth to meet the enemy.

And Moses said unto Joshua, Choose us out men, and go out, fight with Amalek: to morrow I will stand on the top of the {f} hill with the rod of God in mine hand.

(f) That is, Horeb, which is also called Sinai.

17:9 I will stand on the top of the hill with the rod of God in my land - See how God qualifies his people for, and calls them to various services for the good of his church; Joshua fights, Moses prays, and both minister to Israel. This rod Moses held up, not so much to Israel as to animate them; as to God by way of appeal to him; Is not the battle the Lord's? Is not he able to help, and engaged to help? Witness this rod! Moses was not only a standard - bearer, but an intercessor, pleading with God for success and victory.

Joshua: called Jesus

9. Moses said unto Joshua-or, "Jesus" (Ac 7:45; Heb 4:8). This is the earliest notice of a young warrior destined to act a prominent part in the history of Israel. He went with a number of picked men. There is not here a wide open plain on which the battle took place, as according to the rules of modern warfare. The Amalekites were a nomadic tribe, making an irregular attack on a multitude probably not better trained than themselves, and for such a conflict the low hills and open country around this wady would afford ample space [Robinson].

17:8-16 Israel engaged with Amalek in their own necessary defence. God makes his people able, and calls them to various services for the good of his church. Joshua fights, Moses prays, both minister to Israel. The rod was held up, as the banner to encourage the soldiers. Also to God, by way of appeal to him. Moses was tired. The strongest arm will fail with being long held out; it is God only whose hand is stretched out still. We do not find that Joshua's hands were heavy in fighting, but Moses' hands were heavy in praying; the more spiritual any service is, the more apt we are to fail and flag in it. To convince Israel that the hand of Moses, whom they had been chiding, did more for their safety than their own hands, his rod than their sword, the success rises and falls as Moses lifts up or lets down his hands. The church's cause is more or less successful, as her friends are more or less strong in faith, and fervent in prayer. Moses, the man of God, is glad of help. We should not be shy, either of asking help from others, or of giving help to others. The hands of Moses being thus stayed, were steady till the going down of the sun. It was great encouragement to the people to see Joshua before them in the field of battle, and Moses above them on the hill. Christ is both to us; our Joshua, the Captain of our salvation, who fights our battles, and our Moses, who ever lives, making intercession above, that our faith fail not. Weapons formed against God's Israel cannot prosper long, and shall be broken at last. Moses must write what had been done, what Amalek had done against Israel; write their bitter hatred; write their cruel attempts; let them never be forgotten, nor what God had done for Israel in saving them from Amalek. Write what should be done; that in process of time Amalek should be totally ruined and rooted out. Amalek's destruction was typical of the destruction of all the enemies of Christ and his kingdom.