Acts 11:8

'No, Lord, I cannot,' I answered, 'for nothing 'defiled' or 'unclean' has ever passed my lips.'

Romans 14:14

Through my union with the Lord Jesus, I know and am persuaded that nothing is 'defiling in itself.' A thing is 'defiling' only to him who holds it to be so.

Mark 7:2

They had noticed that some of his disciples ate their food with their hands 'defiled,' by which they meant unwashed.

1 Corinthians 7:14

For, through his wife, the husband who is an unbeliever has become associated with Christ's People; and the wife who is an unbeliever has become associated with Christ's People through our Brother whom she has married. Otherwise your children would be 'defiled,' but, as it is, they belong to Christ's People.

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 ate their food with their hands 'defiled,' by which they meant unwashed.
Romans 14:14
Through my union with the Lord Jesus, I know and am persuaded that nothing is 'defiling in itself.' A thing is 'defiling' only to him who holds it to be so.