Psalms 44:4 - Ellicott's Commentary On The Whole Bible

Thou art my King. — Literally, Thou, He, my king, an idiomatic way of making a strong assertion, Thou, even thou, art my king, O God. (Comp. Isaiah 43:25.) What God has done in the past may be expected again, and for a moment the poet forgets the weight of actual trouble in the faith that has sprung from the grateful retrospect over the past.