Romans 14:5
One man thinks that one day is better than another; another thinks that every day is alike. Let each be fully assured in his own mind.
Romans 14:23
But he that doubts is condemned, if he eat, because he eats not with faith. Every thing that is not of faith, is sin.
Romans 14:14
I know and am persuaded in the Lord Jesus, that there is nothing unclean of itself; but if any one thinks that any thing is unclean, to him it is unclean.
1 Corinthians 8:7
But all have not this knowledge; for some, under the persuasion that an idol is a reality, even yet eat meat, as if it were offered to an idol, and their conscience being weak, is defiled.
1 Corinthians 8:11
and will not the weak brother, for whom Christ died, perish through your knowledge?
Galatians 4:9-10
now, however, after having known God, rather indeed having been known by God, how is it that you are turning back to the weak and beggarly rudiments, to which you desire again to be in bondage, as at first?
Colossians 2:16-17
Let no one judge you, therefore, in meat or in drink, or in respect to a feast, or the new moon, or sabbaths,
1 John 3:19-21
And by this we know that we are of the truth; and we shall have our hearts at rest before him: