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
And he that doubteth is damned if he eateth, because he eateth not from faith: for whatever is not from faith is sin.
Romans 14:14
I know, and am persuaded by the Lord Jesus, that there is nothing unclean by itself: but to him that esteemeth any thing to be unclean, to him it is unclean.
1 Corinthians 8:7
But there is not in every man that knowledge: for some with conscience of the idol to this hour eat it as a thing offered to an 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, after ye have known God, or rather are known by God, how turn ye again to the weak and beggarly elements, to which ye desire again to be in bondage?
Colossians 2:16-17
Let no man therefore judge you in food, or in drink, or in respect of a holy-day, or or the new-moon, or of the sabbaths:
1 John 3:19-21
And by this we know that we are of the truth, and shall assure our hearts before him.