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, Psa 89:3, which is firm, sure, and stable, and as immovable as mountains and hills, and more so, Sa2 23:5 or "profane" (m) it, though his people profane his statutes, Psa 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" (n); 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, Luk 1:45. (m) "non prophanabo", V. L. Pagninus, Montanus, Tigurine version, &c. (n) "non mutabo", Pagninus, Montanus, Tigurine version, Junius & Tremellius, &c.