Acts 11:8

and I said, Not so, Lord; because anything common or unclean hath at no time entered into my mouth;

Romans 14:14

I have known, and am persuaded, in the Lord Jesus, that nothing is unclean of itself, except to him who is reckoning anything to be unclean -- to that one it is unclean;

Leviticus 10:10

so as to make a separation between the holy and the common, and between the unclean and the pure;

Leviticus 11:47

to make separation between the unclean and the pure, and between the beast that is eaten, and the beast that is not eaten.'

Ezra 9:11-12

that Thou hast commanded by the hands of thy servants the prophets, saying, The land into which ye are going to possess it, is a land of impurity, by the impurity of the people of the lands, by their abominations with which they have filled it -- from mouth unto mouth -- by their uncleanness;

Hosea 9:3

They do not abide in the land of Jehovah, And turned back hath Ephraim to Egypt, And in Asshur an unclean thing they eat.

Mark 7:2

and having seen certain of his disciples with defiled hands -- that is, unwashed -- eating bread, they found fault;

1 Corinthians 7:14

for the unbelieving husband hath been sanctified in the wife, and the unbelieving wife hath been sanctified in the husband; 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 having seen certain of his disciples with defiled hands -- that is, unwashed -- eating bread, they found fault;
Romans 14:14
I have known, and am persuaded, in the Lord Jesus, that nothing is unclean of itself, except to him who is reckoning anything to be unclean -- to that one it is unclean;