Acts 10:12-14

in which were all kinds of four-footed creatures, and wild beasts, and creeping things, and fowls of the air.

Romans 14:14

I know and have been taught by the Lord Jesus, that nothing is unclean of itself: only to him that thinketh any thing unclean, to him it is unclean.

1 Corinthians 10:28

But if any one say to you, This hath been sacrificed to an idol,---eat it not; for his sake who informed thee, and for conscience-sake: for, as I said, the earth is the Lord's, and the fulness thereof, so that thou mayst have food enough without it.

Titus 1:15

To the pure indeed all things are pure; but to the polluted and unbelieving nothing is pure; even their mind and conscience is polluted.

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