Acts 11:8

But I said, 'No, Lord; for nothing common or unclean has ever entered my mouth.'

Romans 14:14

I know and am convinced in the Lord Jesus that nothing is unclean in itself; but if anyone regards something as unclean, then for him it is unclean.

Mark 7:2

they saw some of his disciples eating food with hands that were defiled, that is, unwashed.

1 Corinthians 7:14

For the unbelieving husband is sanctified through his wife, and the unbelieving wife is sanctified through her husband. Otherwise, your children would be unclean, but as it is they are holy.

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
they saw some of his disciples eating food with hands that were defiled, that is, unwashed.
Romans 14:14
I know and am convinced in the Lord Jesus that nothing is unclean in itself; but if anyone regards something as unclean, then for him it is unclean.