Acts 11:8

But I said, 'Not so, Lord, for nothing unholy or unclean has ever entered into my mouth.'

Romans 14:14

I know, and am persuaded in the Lord Jesus, that nothing is unclean of itself; except that to him who considers anything to be unclean, to him it is unclean.

Leviticus 10:10

and that you are to make a distinction between the holy and the common, and between the unclean and the clean;

Leviticus 11:47

to make a distinction between the unclean and the clean, and between the living thing that may be eaten and the living thing that may not be eaten.'"

Ezra 9:11-12

which you have commanded by your servants the prophets, saying, 'The land, to which you go to possess it, is an unclean land through the uncleanness of the peoples of the lands, through their abominations, which have filled it from one end to another with their filthiness.

Hosea 9:3

They won't dwell in Yahweh's land; but Ephraim will return to Egypt, and they will eat unclean food in Assyria.

Mark 7:2

Now when they saw some of his disciples eating bread with defiled, that is, unwashed, hands, they found fault.

1 Corinthians 7:14

For the unbelieving husband is sanctified in the wife, and the unbelieving wife is sanctified in the husband. Otherwise your children would be 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
Now when they saw some of his disciples eating bread with defiled, that is, unwashed, hands, they found fault.
Romans 14:14
I know, and am persuaded in the Lord Jesus, that nothing is unclean of itself; except that to him who considers anything to be unclean, to him it is unclean.