John Gill Commentary Psalms 84:8

"O Jehovah God of hosts, hear my prayer; Give ear, O God of Jacob. Selah" — Psalms 84:8 (ASV)

O Lord God of hosts, hear my prayer
the redemption of the captives, says Kimchi; for the building of the house, the temple, according to Jarchi; but rather for the courts of God, an opportunity of attending them, and for the presence of God in them; see (Psalms 84:2) in which he might hope to succeed, from the consideration of the Lord's being the God of hosts, or armies, in heaven and in earth; and so was able to do everything for him, and more for him than he could ask or think; his arm was not shortened, nor his ear heavy, (Isaiah 59:1) , and as this character is expressive of his power, the following is of his grace:

give ear, O God of Jacob ;
he being the covenant God of the people of Israel in general, and of David in particular; from which he might comfortably conclude he would give ear to him, and it carries in it an argument why he should.

Selah. (See Gill on Psalms 3:2).