[Albion Wilde]

You shall not make any cuts on your body for the dead or tattoo yourselves: I am the Lord.
—Leviticus 19:28

Do you not know that your body is a temple of the Holy Spirit within you, whom you have from God? You are not your own.
—1 Corinthians 6:19

So, whether you eat or drink, or whatever you do, do all to the glory of God.
—1 Corinthians 10:31

Let your adorning be the hidden person of the heart with the imperishable beauty of a gentle and quiet spirit, which in God’s sight is very precious.
—1 Peter 3:4

“All things are lawful,” but not all things are helpful. “All things are lawful,” but not all things build up.
—1 Corinthians 10:23-24

Whatever does not proceed from faith is sin.
—Romans 14:23

Submit yourselves therefore to God. Resist the devil, and he will flee from you.
—James 4:7

[SunkenCiv]

The tattoo of the ID number on the arms of victims of the Holocaust were imposed for that reason.

[Midwesterner53]

I would add: Have some common sense and leave your body alone.