Acts 11:8

but I said, Lord, by no means: for I never did eat any thing impure, and defiled.

Romans 14:14

I know, being fully assured by the Lord Jesus, that there is nothing unclean of itself: it is only so to him that thinks it is unclean.

Mark 7:2

when observing that some of his disciples were eating with profane hands, that is, without having wash'd them, they found fault.

1 Corinthians 7:14

for the unbelieving husband is christianiz'd by the believing wife, and the unbelieving wife is christianiz'd by the believing husband: else were your children heathens: whereas they are christians.

Treasury of Scripture Knowledge

Summary

But I said, Not so, Lord: for nothing common or unclean hath at any time entered into my mouth.

Bible References

Common

Mark 7:2
when observing that some of his disciples were eating with profane hands, that is, without having wash'd them, they found fault.
Romans 14:14
I know, being fully assured by the Lord Jesus, that there is nothing unclean of itself: it is only so to him that thinks it is unclean.