en_tn_condensed/psa/089/002.md

Covenant faithfulness has been established forever

God always doing what he promised to do is spoken of as if his faithfulness were a building that God has built and made firm. This can be stated in active form. AT: "You will always be faithful because of your covenant with us" (See: rc://en/ta/man/translate/figs-metaphor and rc://en/ta/man/translate/figs-activepassive)

your truthfulness you have established in the heavens

God always doing what he promised to do is spoken of as if his faithfulness were a building that God has built and made firm. (See: rc://en/ta/man/translate/figs-metaphor)

in the heavens

Possible meanings are 1) this refers to God's dwelling place. This would mean God rules from heaven and he always does what he promises or 2) this refers to the sky. This would mean that God's promises are as constant and permanent as the sky .