2 Corinthians 1:18–20

Paul says all of God's promises have their Yes in the Messiah

18But as God is faithful, our word to you is not “Yes and No.”

19For the Son of God, Jesus the Messiah, who was proclaimed among you by us, by me and Silvanus and Timothy, did not become “Yes and No,” but in him “Yes” has come to be.

20For as many as are the promises of God, in him is the “Yes.” Therefore also through him goes the “Amen” to God for glory through us.

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In its context

16and to pass through you into Macedonia, and to come back from Macedonia to you and to be sent on my way by you to Judea.

17So when I intended this, surely I did not act with fickleness? Or what I plan, do I plan it according to the flesh, so that with me there may be “Yes, yes” and “No, no”?

…

21And the one who establishes us with you in the Messiah and anointed us is God,

22who also sealed us and gave us the down payment of the Spirit in our hearts.

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Its words in the original

Faithfulness