Mark 7:15

there is nothing outside a man [such as food] which by going into him can defile him [morally or spiritually]; but the things which come out of [the heart of] a man are what defile and dishonor him.

Leviticus 11:42-47

Whatever crawls on its belly, and whatever walks on all fours, and whatever has many feet among all things that swarm on the ground, you shall not eat; for they are detestable.

Proverbs 4:23

Watch over your heart with all diligence,
For from it flow the springs of life.

Matthew 12:34

You brood of vipers, how can you speak good things when you are evil? For the mouth speaks out of that which fills the heart.

Matthew 15:16

And He said, “Are you still so dull [and unable to put things together]?

Mark 7:18-23

And He said to them, “Are you, too, so foolish and lacking in understanding? Do you not understand that whatever goes into the man from outside cannot defile and dishonor him,

Acts 10:14-16

But Peter said, “Not at all, Lord, for I have never eaten anything that is common (unholy) and [ceremonially] unclean.”

He said to them, “You know that it is unlawful for a Jewish man to associate with or befriend a Gentile, or to visit him; and yet God has shown me that I am not to call anyone common or [ceremonially] unclean.

Acts 11:8-10

But I said, ‘Not at all, Lord; for nothing common (unholy) or [ceremonially] unclean has ever entered my mouth.’

Acts 15:20-21

but that we write to them that they are to abstain from anything that has been contaminated by [being offered to] idols and from sexual impurity and from [eating the meat of] what has been strangled and from [the consumption of] blood.

Romans 14:17

for the kingdom of God is not a matter of eating and drinking [what one likes], but of righteousness and peace and joy in the Holy Spirit.

1 Corinthians 10:25

[Regarding meat offered to idols:] Eat anything that is sold in the meat market without asking any questions for the sake of your conscience,

1 Timothy 4:3-5

who forbid marriage and advocate abstaining from [certain kinds of] foods which God has created to be gratefully shared by those who believe and have [a clear] knowledge of the truth.

Titus 1:15

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

Hebrews 9:10

For they [the gifts, sacrifices, and ceremonies] deal only with [clean and unclean] food and drink and various ritual washings, [mere] external regulations for the body imposed [to help the worshipers] until the time of reformation [that is, the time of the new order when Christ will establish the reality of what these things foreshadow—a better covenant].

Hebrews 13:9

Do not be carried away by diverse and strange teachings; for it is good for the heart to be established and strengthened by grace and not by foods [rules of diet and ritualistic meals], which bring no benefit or spiritual growth to those who observe them.

Treasury of Scripture Knowledge

Summary

Mark 7:15

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.

Nothing

But

General references

Bible References