Romans 14:5
One man esteemeth one day above another; another esteemeth every day alike; let every man be fully persuaded in his own mind.
Romans 14:23
But he that doubteth is condemned if he eat, because it is not of faith; for whatsoever is not of faith, is sin.
Romans 14:14
I know and am assured by the Lord Jesus, that nothing is unclean of itself: but to him that accounteth any thing to be unclean, it is unclean.
1 Corinthians 8:7
But there is not in all men this knowledge; for some do even until now, with consciousness of the idol, eat it as sacrificed to the idol, and their conscience, being weak, is defiled.
1 Corinthians 8:11
And through thy knowledge shall the weak brother perish, for whom Christ died.
Galatians 4:9-10
But now having known God, or rather being known of God, how turn ye back to the weak and beggarly elements, to which ye desire to be in bondage again?
Colossians 2:16-17
Let none therefore judge you in meat, or drink, or in respect of a feast-day, or of the new-moon, or of sabbath-days: Which are shadow of things to come;
1 John 3:19-21
And hereby we know that we are of the truth, and shall assure our hearts before him.