He teacheth my hands to war,.... From whence it appears, that war, in some cases, is lawful; and that all the skilfulness and art in training men for war, in the use of armour, in marshalling of armies, in forming sieges, &c.
is all from God; see Ps 144:1; and so is all that spiritual skill, in making use of the whole armour of God against every enemy, sin, Satan, and the world; and even the wisdom and skill, counsel and instruction, which Christ as man and Mediator had, when it was the hour and power of darkness; when he was engaged with principalities and powers, and got the victory over them, were from the Lord: see Ps 16:7;so that a bow of steel is broken by mine arms; that is, the bow of an enemy falling into his hands, which might be literally true of David.