Mark 7:15

there is nothing from without the man, that going into him can defile him; but the things which proceed out of the man are those that defile the man.

Leviticus 11:42-47

Whatsoever goeth upon the belly, and whatsoever goeth upon all fours, or whatsoever hath many feet, even all creeping things that creep upon the earth, them ye shall not eat; for they are an abomination.

Proverbs 4:23

Keep thy heart with all diligence; For out of it are the issues of life.

Matthew 12:34

Ye offspring of vipers, how can ye, being evil, speak good things? for out of the abundance of the heart the mouth speaketh.

Matthew 15:16

And he said, Are ye also even yet without understanding?

Mark 7:18-23

And he saith unto them, Are ye so without understanding also? Perceive ye not, that whatsoever from without goeth into the man, it cannot defile him;

Acts 10:14-16

But Peter said, Not so, Lord; for I have never eaten anything that is common and unclean.

Acts 10:28

and he said unto them, Ye yourselves know how it is an unlawful thing for a man that is a Jew to join himself or come unto one of another nation; and yet unto me hath God showed that I should not call any man common or unclean:

Acts 11:8-10

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

Acts 15:20-21

but that we write unto them, that they abstain from the pollutions of idols, and from fornication, and from what is strangled, and from blood.

Romans 14:17

for the kingdom of God is not eating and drinking, but righteousness and peace and joy in the Holy Spirit.

1 Corinthians 10:25

Whatsoever is sold in the shambles, eat, asking no question for conscience'sake,

1 Timothy 4:3-5

forbidding to marry, and commanding to abstain from meats, which God created to be received with thanksgiving by them that believe and know the truth.

Titus 1:15

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

Hebrews 9:10

being only (with meats and drinks and divers washings) carnal ordinances, imposed until a time of reformation.

Hebrews 13:9

Be not carried away by divers and strange teachings: for it is good that the heart be established by grace; not by meats, wherein they that occupied themselves were not profited.

Treasury of Scripture Knowledge

Summary

There is nothing from without a man, that entering into him can defile him: but the things which come out of him, those are they that defile the man.

Bible References

Nothing

Mark 7:18
And he saith unto them, Are ye so without understanding also? Perceive ye not, that whatsoever from without goeth into the man, it cannot defile him;
Leviticus 11:42
Whatsoever goeth upon the belly, and whatsoever goeth upon all fours, or whatsoever hath many feet, even all creeping things that creep upon the earth, them ye shall not eat; for they are an abomination.
Acts 10:14
But Peter said, Not so, Lord; for I have never eaten anything that is common and unclean.
Acts 11:8
But I said, Not so, Lord: for nothing common or unclean hath ever entered into my mouth.
Acts 15:20
but that we write unto them, that they abstain from the pollutions of idols, and from fornication, and from what is strangled, and from blood.
Romans 14:17
for the kingdom of God is not eating and drinking, but righteousness and peace and joy in the Holy Spirit.
1 Corinthians 10:25
Whatsoever is sold in the shambles, eat, asking no question for conscience'sake,
1 Timothy 4:3
forbidding to marry, and commanding to abstain from meats, which God created to be received with thanksgiving by them that believe and know the truth.
Titus 1:15
To the pure all things are pure: but to them that are defiled and unbelieving nothing is pure; but both their mind and their conscience are defiled.
Hebrews 9:10
being only (with meats and drinks and divers washings) carnal ordinances, imposed until a time of reformation.
Hebrews 13:9
Be not carried away by divers and strange teachings: for it is good that the heart be established by grace; not by meats, wherein they that occupied themselves were not profited.

But

Mark 7:20
And he said, That which proceedeth out of the man, that defileth the man.
Proverbs 4:23
Keep thy heart with all diligence; For out of it are the issues of life.
Matthew 12:34
Ye offspring of vipers, how can ye, being evil, speak good things? for out of the abundance of the heart the mouth speaketh.
Matthew 15:16
And he said, Are ye also even yet without understanding?

General references

Leviticus 11:2
Speak unto the children of Israel, saying, These are the living things which ye may eat among all the beasts that are on the earth.
Jeremiah 25:2
which Jeremiah the prophet spake unto all the people of Judah, and to all the inhabitants of Jerusalem, saying:
Matthew 13:9
He that hath ears, let him hear.
Mark 7:20
And he said, That which proceedeth out of the man, that defileth the man.

American Standard Version Public Domain