Romans 14:5
One man esteems one day as more important. Another esteems every day alike. Let each man be fully assured in his own mind.
Romans 14:23
But he who doubts is condemned if he eats, because it isn't of faith; and whatever is not of faith is sin.
Romans 14:14
I know, and am persuaded in the Lord Jesus, that nothing is unclean of itself; except that to him who considers anything to be unclean, to him it is unclean.
1 Corinthians 8:7
However, that knowledge isn't in all men. But some, with consciousness of the idol until now, eat as of a thing sacrificed to an idol, and their conscience, being weak, is defiled.
1 Corinthians 8:11
And through your knowledge, he who is weak perishes, the brother for whose sake Christ died.
Galatians 4:9-10
But now that you have come to know God, or rather to be known by God, why do you turn back again to the weak and miserable elemental principles, to which you desire to be in bondage all over again?
Colossians 2:16-17
Let no one therefore judge you in eating, or in drinking, or with respect to a feast day or a new moon or a Sabbath day,
1 John 3:19-21
And by this we know that we are of the truth, and persuade our hearts before him,