Romans 14:5
One man prefers one day above another, another man prefers every day. Let each man be fully persuaded in his own mind.
Romans 14:23
But he who doubts is condemned if he eats, because it is not from faith, and everything that is not from faith is sin.
Romans 14:14
I know and am persuaded in Lord Jesus, that nothing is profane by itself, except to him who regards anything to be profane. To that man it is profane.
1 Corinthians 8:7
Nevertheless the knowledge is not in all men, but some, with conscience of the idol until now, eat as sacrificed to idols, and their weak conscience is defiled.
1 Corinthians 8:11
And by thy knowledge the brother, being weak, will be ruined, for whom Christ died.
Galatians 4:9-10
but now knowing God, but rather being known by God, how is it ye turn again to the weak and destitute elements to which ye desire again to be in bondage anew?
Colossians 2:16-17
Let not any man therefore judge you in eating, or in drinking, or in the matter of a festival or a new moon or Sabbaths,
1 John 3:19-21
And by this we know that we are of the truth, and will assure our hearts before him.