Where it appears

• 1 Cor 5:8Therefore let us keep the feast, not with old yeast, neither with the yeast of malice and wickedness, but with the unleavened bread of sincerity and truth.
• 2 Cor 1:12For our boasting is this: the testimony of our conscience, that in holiness and sincerity of God, not in fleshly wisdom but in the grace of God we behaved ourselves in the world, and more abundantly toward you.
• 2 Cor 2:17For we are not as so many, peddling the word of God. But as of sincerity, but as of God, in the sight of God, we speak in Christ.