Albert Barnes Commentary Psalms 119:89

"For ever, O Jehovah, Thy word is settled in heaven." — Psalms 119:89 (ASV)

Forever, O Lord, thy word is settled in heaven - This begins a new division of the psalm, indicated by the Hebrew letter Lamed (ל l), or “l.” On the meaning of the passage, see the notes at Psalm 89:2.

The word rendered “settled” properly means “to set, to put, to place;” and then, to stand, to cause to stand, to set up, as a column (Genesis 35:20); an altar (Genesis 33:20); a monument (1 Samuel 15:12). The meaning here is, that the word - the law - the promise - of God was made firm, established, stable, in heaven; and would be so forever and ever. What God had ordained as law would always remain law; what he had affirmed would always remain true; what he had promised would be sure forever.