Romans 14:5
One man esteems one day above another: another esteems every day alike. Let every man be fully persuaded in his own mind.
Romans 14:23
And he that doubts is condemned if he eats, because he eats not of faith: for whatever is not of faith is sin.
Romans 14:14
I know, and am persuaded by the Lord Jesus, that there is nothing unclean of itself: but to him that esteems anything 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 about the idol unto this hour eat it as a thing offered unto an idol; and their conscience being weak is defiled.
1 Corinthians 8:11
And through your knowledge shall the weak brother perish, for whom Christ died?
Galatians 4:9-10
But now, after you have known God, or rather are known of God, how turn you again to the weak and beggarly elements, to which you 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 of the new moon, or of the sabbath days:
1 John 3:19-21
And by this we know that we are of the truth, and shall assure our hearts before him.