John Gill Commentary Psalms 44:4

"Thou art my King, O God: Command deliverance for Jacob." — Psalms 44:4 (ASV)

You are my King, O God. Besides the favours God had done for his people in time past, the church takes notice of her interest in God as her King, who was able to protect and defend her, and to deliver her out of all her distresses, in order the more to strengthen her faith and hope in him.

And, claiming her interest in him, she draws nigh to him with an holy boldness, and desires him as a King, that by a word of his (for where the word of a king is, there is power) he would command deliverances for Jacob.

This is not literally, but mystically understood; the spiritual Jacob, and people of God; all Israelites indeed, in whom there is no guile; meaning herself and members.

The blessing desired is "deliverances", or "salvations"; so called, because the deliverance or salvation the Lord commands, grants, and works out for his people is of different kinds, both spiritual and temporal, and is a deliverance from various things: from sin, Satan, the present evil world, wrath to come, and all enemies; and out of various temptations and afflictions, which follow successively one upon another; and at last it is complete and perfect.