The Covenant is Unalterable
Source: TTT
Psalm 89:34
I will not violate My covenant or alter the utterance of My lips.
Isaiah 54:10
Though the mountains may be removed and the hills may be shaken, My loving devotion will not depart from you, and My covenant of peace will not be broken,” says the LORD, who has compassion on you.
Isaiah 59:21
“As for Me, this is My covenant with them,” says the LORD. “My Spirit will not depart from you, and My words that I have put in your mouth will not depart from your mouth or from the mouths of your children and grandchildren, from now on and forevermore,” says the LORD.
Galatians 3:17
What I mean is this: The law that came 430 years later does not revoke the covenant previously established by God, so as to nullify the promise.