Charles Ellicott Commentary Psalms 147:10

"He delighteth not in the strength of the horse: He taketh no pleasure in the legs of a man." — Psalms 147:10 (ASV)

Strength of the horse ... legs of a man. —This somewhat strange antithesis has been explained to refer to cavalry and infantry, but the much more expressive passage, Psalms 33:16–17, which was plainly before this poet, would hardly have been altered so strangely. The horse as a type of strength and endurance was of course common. (Compare to especially Job 39:19-25.) And we have before seen that Eastern nations naturally select fleetness of foot as the typical quality in a vigorous warrior. (See Psalm 18:33.)

The constant epithet “swift-footed Achilles,” suggests the best explanation of the second clause of the verse. (Compare to 2 Samuel 2:18.)