Then came {e} Amalek, and fought with Israel in Rephidim.

(e) Who came from Eliphaz, son of Esau, Ge 36:12.

Wesley's Notes

17:8 Then Amalek came and fought with Israel - The Amalekites were the posterity of Esau, who hated Jacob because of the birth - right and blessing. They did not boldly front them as a generous enemy, but without any provocation given, basely fell upon their rear, and smote them that were faint and feeble.

Jamieson-Fausset-Brown Bible Commentary

Ex 17:8-16. Attack of Amalek.

8. Then came Amalek-Some time probably elapsed before they were exposed to this new evil; and the presumption of there being such an interval affords the only ground on which we can satisfactorily account for the altered, the better, and former spirit that animated the people in this sudden contest. The miracles of the manna and the water from the rock had produced a deep impression and permanent conviction that God was indeed among them; and with feelings elevated by the conscious experience of the Divine Presence and aid, they remained calm, resolute, and courageous under the attack of their unexpected foe.

fought with Israel-The language implies that no occasion had been furnished for this attack; but, as descendants of Esau, the Amalekites entertained a deep-seated grudge against them, especially as the rapid prosperity and marvellous experience of Israel showed that the blessing contained in the birthright was taking effect. It seems to have been a mean, dastardly, insidious surprise on the rear (Nu 24:20; De 25:17), and an impious defiance of God.

Matthew Henry's Concise Commentary

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.