“But Moses' hands were heavy; and they took a stone, and put it under him, and he sat thereon; and Aaron and Hur stayed up his hands, the one on the one side, and the other on the other side; and his hands were steady until the going down of the sun.”
King James Version (KJV)
17:10 Hur is supposed to have been the husband of Miriam.
17:11 And when Moses held vp his hand in prayer (so the Chaldee explains it) Israel prevailed, but when he let down his hand from prayer, Amalek prevailed - To convince Israel that the hand of Moses (with whom they had just now been chiding) contributed more to their safety than their own hands; the success rises and falls, as Moses lifts up or lets down his hand. The church's cause is ordinarily more or less successful, according as the church's friends are more or less fervent in prayer.
17:13 Though God gave the victory, yet it is said Joshua discomfited Amalek, because Joshua was a type of Christ, and of the same name, and in him it is that we are more than conquerors.