Acts 11:8

But I said, 'Certainly not, Lord! For nothing common or unclean has ever entered into my mouth!'

Romans 14:14

I know and am convinced in the Lord Jesus that nothing [is] unclean of itself, except to the one who considers something to be unclean; to that person [it is] unclean.

Leviticus 10:10

and to distinguish between the holy and the unholy, as well as between the unclean and the clean,

Leviticus 11:47

to distinguish between the unclean and the clean and between the animal that is to be eaten and the animal that must not be eaten.'"

Ezra 9:11-12

which you commanded by the hand of your servants the prophets saying, 'The land that you are entering to possess is a land of impurity with the impurity of the peoples of the lands, with their detestable things which they have filled from end to end with their uncleanness.

Hosea 9:3

They will not remain in the land of Yahweh. But Ephraim will return [to] Egypt, and in Assyria they will eat unclean food.

Mark 7:2

And they saw that some of his disciples were eating their bread with unclean--that is, unwashed--hands.

1 Corinthians 7:14

For the unbelieving husband is sanctified by his wife, and the unbelieving wife is sanctified by the brother, since otherwise your children are unclean, but now 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
And they saw that some of his disciples were eating their bread with unclean--that is, unwashed--hands.
Romans 14:14
I know and am convinced in the Lord Jesus that nothing [is] unclean of itself, except to the one who considers something to be unclean; to that person [it is] unclean.