2 Corinthians 1:18-20

But as surely as God is faithful, our message to you is not “Yes” and “No.” For the Son of God, Jesus Christ, who was preached among you by us—by me and Silas and Timothy—was not “Yes” and “No,” but in him it has always been “Yes.” For no matter how many promises God has made, they are “Yes” in Christ. And so through him the “Amen” is spoken by us to the glory of God.