2 Corinthians 1:20

18 But as God is true, our word toward you was not yea and nay.

19 For the Son of God, Jesus Christ, who was preached among you by us, even by me and Silvanus and Timotheus, was not yea and nay, but in him was yea.

For all the promises of God in him are yea, and in him Amen, unto the glory of God by us.

21 Now he which stablisheth us with you in Christ, and hath anointed us, is God;

22 Who hath also sealed us, and given the earnest of the Spirit in our hearts.

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB
For all the promises of God are “Yes” in Christ. And so through Him, our “Amen” is spoken to the glory of God.
KJV
For all the promises of God in him are yea, and in him Amen, unto the glory of God by us.
WEB
For however many are the promises of God, in him is the “Yes.” Therefore also through him is the “Amen”, to the glory of God through us.
ASV
For how many soever be the promises of God, in him is the yea: wherefore also through him is the Amen, unto the glory of God through us.
DARBY
For whatever promises of God [there are], in him is the yea, and in him the amen, for glory to God by us.
BLB
For as many as [are] the promises of God, in Him [is] the “Yes.” Therefore also through Him the “Amen” through us [is] for glory to God.
ÅB
for så mange som Guds løfter er, i ham har de sitt ja, derfor får de og ved ham sitt amen, Gud til ære ved oss.
OTB
For så mange som Guds løfter er, i Ham er de "Ja"; derfor sier vi også ved Ham vårt "Amen" til Guds ære.
B1930
for så mange som Guds løfter er, i ham har de sitt ja, derfor får de og ved ham sitt amen, Gud til ære ved oss.

Study notes (Tyndale)

Original text and word study

Cross references