John Gill Commentary Psalms 84:12

"O Jehovah of hosts, Blessed is the man that trusteth in thee." — Psalms 84:12 (ASV)

O Lord of hosts, blessed is the man that trusts in thee ,
&c.] For grace and glory, and every good thing; that trusts in the Lord at all times, and not in the creature, or in an arm of flesh; but in the Lord of hosts and armies, in whom is everlasting strength, and is the sun and shield of his people:

happy are such that trust in him, whether they have ability or opportunity of going up to the house of the Lord, or not; they are happy that have and make use thereof, and so are they that trust in the Lord, whether they have or not; they are safe, being as Mount Zion, which can never be removed; and do and shall enjoy perfect peace and solid comfort here, and eternal happiness hereafter; see (Jeremiah 17:5Jeremiah 17:7) (Isaiah 26:3Isaiah 26:4) .

The Targum is, "blessed is the man that trusts in your Word;" in Christ, the essential Word.