Luke 11:41

But give what they contain in alms, and lo! all is clean to you.

Acts 10:15-16

And a voice came to him again, the second time, That which God hath cleansed, call not thou common.

Acts 10:28

And he said to them, Ye know that it is an unlawful thing for a Jew to keep company with one of another nation, or to come near him; but God showed me that I should not call any man common or unclean.

Romans 14:14

I know, and am persuaded in the Lord Jesus, that nothing is unclean in itself; but to him that accounteth anything to be unclean, to him it is unclean.

Romans 14:20

Do not for the sake of food undo the work of God. All things indeed are clean; but that which is pure is evil for that man who eateth so as to be an occasion of sin.

2 Corinthians 6:17

"Wherefore come out from the midst of them, and be separated, saith the Lord, and touch not anything unclean;" "and I will receive you,

Titus 1:15

To the pure all things are pure; but to the defiled and unbelieving nothing is pure, but both their mind and conscience are defiled.

Treasury of Scripture Knowledge

Summary

And the flesh that toucheth any unclean thing shall not be eaten; it shall be burnt with fire: and as for the flesh, all that be clean shall eat thereof.

Bible References

General references

Luke 11:41
But give what they contain in alms, and lo! all is clean to you.
Acts 10:15
And a voice came to him again, the second time, That which God hath cleansed, call not thou common.
Romans 14:14
I know, and am persuaded in the Lord Jesus, that nothing is unclean in itself; but to him that accounteth anything to be unclean, to him it is unclean.
2 Corinthians 6:17
"Wherefore come out from the midst of them, and be separated, saith the Lord, and touch not anything unclean;" "and I will receive you,
Titus 1:15
To the pure all things are pure; but to the defiled and unbelieving nothing is pure, but both their mind and conscience are defiled.