Psalms 89:34

My covenant will I not break ,.... Not the covenant at Sinai, as Aben Ezra, but the covenant of grace made with Christ, and which stands fast with him, Psalm 89:3 , which is firm, sure, and stable, and as immovable as mountains and hills, and more so, 2 Samuel 23:5 or "profane" F13 לא אחלל "non prophanabo", V. L. Pagninus, Montanus, Tigurine version, &c.; it, though his people profane his statutes, Psalm 89:31 , he will not profane his covenant; though they violate his laws, he is a God keeping covenant with them, and will not break his word with them:

nor alter the thing that is gone out of my lips ; any promise of his, respecting either the temporal, spiritual, or eternal welfare of his people: or "not change" F14 לא אשנה "non mutabo", Pagninus, Montanus, Tigurine version, Junius & Tremellius, &c.; ; as he changes not in his nature and perfections, nor in his love and affections, nor in his counsels and purposes; so neither in his covenant and promises, they are always the same, and have a certain and unchangeable accomplishment; there is a performance of whatsoever is spoken by the Lord, Luke 1:45 .