Exodus 17:12 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.
[Patriarchs & Prophets pp 299] As Aaron and Hur supported the hands of Moses, they showed the people their duty to sustain him in his arduous work while he should receive the word from God to speak to them. And the act of Moses also was significant, showing that God held their destiny in His hands; while they made Him their trust, He would fight for them and subdue their enemies; but when they should let go their hold upon Him, and trust in their own power, they would be even weaker than those who had not the knowledge of God, and their foes would prevail against them.
As the Hebrews triumphed when Moses was reaching his hands toward heaven and interceding in their behalf, so the Israel of God prevail when they by faith take hold upon the strength of their mighty Helper. Yet divine strength is to be combined with human effort. Moses did not believe that God would overcome their foes while Israel remained inactive. While the great leader was pleading with the Lord, Joshua and his brave followers were putting forth their utmost efforts to repulse the enemies of Israel and of God.
After the defeat of the Amalekites, God directed Moses, “Write this for a memorial in a book, and rehearse it in the ears of Joshua: for I will utterly put out the remembrance of Amalek from under heaven.” Just before his death the great leader delivered to his people the solemn charge: “Remember what Amalek did unto thee by the way, when ye were come forth out of Egypt; how he met thee by the way, and smote the hindmost of thee, even all that were feeble behind thee, when thou wast faint and weary; and he feared not God.
Exodus 17:15 And Moses built an altar, and called the name of it Jehovahnissi: 16 For he said, Because the Lord hath sworn that the Lord will have war with Amalek from generation to generation.
May The Lord add His blessing to the study of His word. God bless!