The proper name of Joshua, who appears here for the first time in the service of Moses, as Hosea (הושׁע); he was a prince of the tribe of Ephraim (Numbers 13:8, Numbers 13:16; Deuteronomy 32:44). The name יהושׁע, "Jehovah is help" (or, God-help), he probably received at the time when he entered Moses' service, either before or after the battle with the Amalekites (see Numbers 13:16, and Hengstenberg, Dissertations, vol. ii.). Hur, who also held a prominent position in the nation, according to Exodus 24:14, in connection with Aaron, was the son of Caleb, the son of Hezron, the grandson of Judah (1 Chronicles 2:18-20), and the grandfather of Bezaleel, the architect of the tabernacle (Exodus 31:2; Exodus 35:30; Exodus 38:22, cf. 1 Chronicles 2:19-20). According to Jewish tradition, he was the husband of Miriam.

The battle was fought on the day after the first attack (Exodus 17:9). The hill (גּבעה, not Mount Horeb), upon the summit of which Moses took up his position during the battle, along with Aaron and Hur, cannot be fixed upon with exact precision, but it was probably situated in the table-land of Fureia, to the north of er Rahah and the Sheikh valley, which is a fertile piece of pasture ground (Burckhardt, p. 801; Robinson, i. pp. 139, 215), or else in the plateau which runs to the north-east of the Horeb mountains and to the east of the Sheikh valley, with the two peaks Umlanz and Um Alawy; supposing, that is, that the Amalekites attacked the Israelites from Wady Muklifeh or es Suweiriyeh. Moses went to the top of the hill that he might see the battle from thence. He took Aaron and Hur with him, not as adjutants to convey his orders to Joshua and the army engaged, but to support him in his own part in connection with the conflict. This was to hold up his hand with the staff of God in it. To understand the meaning of this sign, it must be borne in mind that, although Exodus 17:11 merely speaks of the raising and dropping of the hand (in the singular), yet, according to Exodus 17:12, both hands were supported by Aaron and Hur, who stood one on either side, so that Moses did not hold up his hands alternately, but grasped the staff with both his hands, and held it up with the two. The lifting up of the hands has been regarded almost with unvarying unanimity by Targumists, Rabbins, Fathers, Reformers, and nearly all the more modern commentators, as the sign or attitude of prayer. Kurtz, on the contrary, maintains, in direct opposition to the custom observed throughout the whole of the Old Testament by all pious and earnest worshipers, of lifting up their hands to God in heaven, that this view attributes an importance to the outward form of prayer which has no analogy even in the Old Testament; he therefore agrees with Lakemacher, in Rosenmller's Scholien, in regarding the attitude of Moses with his hand lifted up as "the attitude of a commander superintending and directing the battle," and the elevation of the hand as only the means adopted for raising the staff, which was elevated in the sight of the warriors of Israel as the banner of victory. But this meaning cannot be established from Exodus 17:15 and Exodus 17:16. For the altar with the name "Jehovah my banner," and the watchword "the hand on the banner of Jehovah, war of the Lord against Amalek," can neither be proved to be connected with the staff which Moses held in his hand, nor be adduced as a proof that Moses held the staff in front of the Israelites as the banner of victory. The lifting up of the staff of God was, no doubt, a banner to the Israelites of victory over their foes, but not in this sense, that Moses directed the battle as commander-in-chief, for he had transferred the command to Joshua; nor yet in this sense, that he imparted divine powers to the warriors by means of the staff, and so secured the victory. To effect this, he would not have lifted it up, but have stretched it out, either over the combatants, or at all events towards them, as in the case of all the other miracles that were performed with the staff. The lifting up of the staff secured to the warriors the strength needed to obtain the victory, from the fact that by means of the staff Moses brought down this strength from above, i.e., from the Almighty God in heaven; not indeed by a merely spiritless and unthinking elevation of the staff, but by the power of his prayer, which was embodied in the lifting up of his hands with the staff, and was so far strengthened thereby, that God had chosen and already employed this staff as a medium of the saving manifestation of His almighty power. There is no other way in which we can explain the effect produced upon the battle by the raising and dropping (הניח) of the staff in his hands. As long as Moses held up the staff, he drew down from God victorious powers for the Israelites by means of his prayer; but when he let it fall through the exhaustion of the strength of his hands, he ceased to draw down the power of God, and Amalek gained the upper hand. The staff, therefore, as it was stretched out on high, was not a sign to the Israelites that were fighting, for it is by no means certain that they could see it in the heat of the battle; but it was a sign to Jehovah, carrying up, as it were, to God the wishes and prayers of Moses, and bringing down from God victorious powers for Israel. If the intention had been the hold it up before the Israelites as a banner of victory. Moses would not have withdrawn to a hill apart from the field of battle, but would either have carried it himself in front of the army, or have given it to Joshua as commander, to be borne by him in front of the combatants, or else have entrusted it to Aaron, who had performed the miracles in Egypt, that he might carry it at their head. The pure reason why Moses did not do this, but withdrew from the field of battle to lift up the staff of God upon the summit of a hill, and to secure the victory by so doing, is to be found in the important character of the battle itself. As the heathen world was now commencing its conflict with the people of God in the persons of the Amalekites, and the prototype of the heathen world, with its hostility to God, was opposing the nation of the Lord, that had been redeemed from the bondage of Egypt and was on its way to Canaan, to contest its entrance into the promised inheritance; so the battle which Israel fought with this foe possessed a typical significance in relation to all the future history of Israel. It could not conquer by the sword alone, but could only gain the victory by the power of God, coming down from on high, and obtained through prayer and those means of grace with which it had been entrusted. The means now possessed by Moses were the staff, which was, as it were, a channel through which the powers of omnipotence were conducted to him. In most cases he used it under the direction of God; but God had not promised him miraculous help for the conflict with the Amalekites, and for this reason he lifted up his hands with the staff in prayer to God, that he might thereby secure the assistance of Jehovah for His struggling people. At length he became exhausted, and with the falling of his hands and the staff he held, the flow of divine power ceased, so that it was necessary to support his arms, that they might be kept firmly directed upwards (אמוּנה, lit., firmness) until the enemy was entirely subdued. And from this Israel was to learn the lesson, that in all its conflicts with the ungodly powers of the world, strength for victory could only be procured through the incessant lifting up of its hands in prayer. "And Joshua discomfited Amalek and his people (the Amalekites and their people) with the edge of the sword" (i.e., without quarter. See Genesis 34:26).