Malachi 3:6

For I am the Lord, I change not Rather: For I, the Lord, change not: therefore (lit. and) ye, sons of Jacob, are not consumed. The unchangeableness of Him, whose name, Jehovah, " I am," is the exponent of His nature, is appealed to as the ground ("for") of His dealings with Israel. He changes not in His promises and purposes of grace (Romans 11:29); therefore, in spite of their rebellions and provocations, the sons of Jacob are still preserved. It is the same argument that is expanded in Psalms 89:28-37.