NET
19 For the Son of God, Jesus Christ, the one who was proclaimed among you by us—by me and Silvanus and Timothy—was not “Yes” and “No,” but it has always been “Yes” in him.
Darby
19 For the Son of God, Jesus Christ, he who has been preached by us among you (by me and Silvanus and Timotheus), did not become yea and nay, but yea *is* in him.
KJV
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.