Acts 11:8

But I answered, 'Never by any means, sir, for nothing common or not ceremonially cleansed has ever passed my lips.'

Romans 14:14

I know, and through my union with the Lord Jesus I have a clear conviction, that nothing is unclean in itself; that a thing is unclean only to the person who thinks it unclean.

Mark 7:2

They had noticed that some of His disciples were in the habit of eating their meals without first giving their hands a ceremonial washing to make them clean.

1 Corinthians 7:14

For the unbelieving husband is consecrated by union with his wife and the unbelieving wife by union with her Christian husband, for otherwise your children would be unblessed, but in this way they are consecrated.

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 had noticed that some of His disciples were in the habit of eating their meals without first giving their hands a ceremonial washing to make them clean.
Romans 14:14
I know, and through my union with the Lord Jesus I have a clear conviction, that nothing is unclean in itself; that a thing is unclean only to the person who thinks it unclean.