Titus 1:15

I know, and am persuaded by the Lord Jesus, that there is nothing unclean of itself: but to him that esteemeth any thing to be unclean, to him it is unclean.

For meat destroy not the work of God. All things indeed are pure; but it is evil for that man who eateth with offence.

All things are lawful for me, but all things are not expedient: all things are lawful for me, but all things edify not.

But those things which proceed out of the mouth come forth from the heart; and they defile the man.

And he that doubteth is damned if he eat, because he eateth not of faith: for whatsoever is not of faith is sin.

And the voice spake unto him again the second time, What God hath cleansed, that call not thou common.

Whether therefore ye eat, or drink, or whatsoever ye do, do all to the glory of God.

Let us draw near with a true heart in full assurance of faith, having our hearts sprinkled from an evil conscience, and our bodies washed with pure water.

Howbeit there is not in every man that knowledge: for some with conscience of the idol unto this hour eat it as a thing offered unto an idol; and their conscience being weak is defiled.

Whatsoever is sold in the shambles, that eat, asking no question for conscience sake:

Perverse disputings of men of corrupt minds, and destitute of the truth, supposing that gain is godliness: from such withdraw thyself.

An high look, and a proud heart, and the plowing of the wicked, is sin.

Then said Haggai, If one that is unclean by a dead body touch any of these, shall it be unclean? And the priests answered and said, It shall be unclean.