John Trapp on Psalms 21:13

Verſ. 13. Bee thou exalted, Lord, in thine own ſtrength] Finit Pſalmum cum laude, ſicut incaepit, ſaith Aben-Ezra, Hee cloſeth up the Pſalm, as hee began it, with praiſe and prayer that God would ariſe and deſtroy thereſt, as hee had allready done ſome of their enemies. Gods power and ſtrength is in it ſelf infinite, and cannot be exalted or amplified; but in reſpect of us it is ſaid to bee exalted, when exerted and put forth for the defence of his people.

So will we ſing and praiſe thy power] This they reſtipulate; as knowing that it would pleaſe the Lord better than an Ox or Bullock that hath hornes and hoofs, Pſal. 69.31.