Acts 11:8

But I said, Not so, Lord: for nothing common or unclean hath at any time entered into my mouth.

Romans 14:14

I know, and am persuaded by the Lord Jesus, that there is nothing unclean by itself: but to him that esteemeth any thing to be unclean, to him it is unclean.

Leviticus 10:10

And that ye may make a difference between holy and unholy, and between unclean and clean;

Leviticus 11:47

To make a difference between the unclean and the clean, and between the beast that may be eaten and the beast that may not be eaten.

Ezra 9:11-12

Which thou hast commanded by thy servants the prophets, saying, The land, to which ye go to possess it, is an unclean land with the filthiness of the people of the lands, with their abominations, which have filled it from one end to another with their uncleanness.

Hosea 9:3

They shall not dwell in the LORD'S land; but Ephraim shall return to Egypt, and they shall eat unclean things in Assyria.

Mark 7:2

And when they saw some of his disciples eating bread with defiled (that is to say with unwashed) hands, they found fault.

1 Corinthians 7:14

For the unbelieving husband is sanctified by the wife, and the unbelieving wife is sanctified by the husband: else were your children unclean; but now are they 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 when they saw some of his disciples eating bread with defiled (that is to say with unwashed) hands, they found fault.
Romans 14:14
I know, and am persuaded by the Lord Jesus, that there is nothing unclean by itself: but to him that esteemeth any thing to be unclean, to him it is unclean.