I will perform

1 Samuel 2:27-36
Then a man of God came to Eli and told him, "This is what the LORD says: 'Did I not clearly reveal Myself to your father's house when they were in Egypt under Pharaoh's house? . . .

Numbers 23:19
God is not a man, that He should lie, or a son of man, that He should change His mind. Does He speak and not act? Does He promise and not fulfill?

Joshua 23:15
But just as every good thing the LORD your God promised you has come to pass, likewise the LORD will bring upon you the calamity He has threatened, until He has destroyed you from this good land He has given you.

Zechariah 1:6
But did not My words and My statutes, which I commanded My servants the prophets, overtake your forefathers? They repented and said, 'Just as the LORD of Hosts purposed to do to us according to our ways and deeds, so He has done to us.'"

Luke 21:33
Heaven and earth will pass away, but My words will never pass away.

when I begin, etc.