Your own body does not belong to you.  For God has bought you with a great price.  So use every part of your body to give glory back to God, because He owns it. Corinthians

And because of what Christ did, all you others too, who heard the good news about how to be saved, and trusted Christ, were marked as belonging to Christ by the Holy Spirit, who long ago had been promised to all of us Christians.  His presence within us is God’s guarantee that He really will give us all that He promised; and that the Spirit’s seal upon us means that God has already purchased us and that He guarantees to bring us to Himself.  This is just one more reason for us to praise our glorious God. Ephesians 1

You shall not cut yourselves nor put tattoo marks upon yourselves in connection with funeral rites; I am the Lord. Leviticus

Then I saw another beast come up out of the earth.

He required everyone - great and small, rich and poor, slave and free - to be given a mark on the right hand or on the forehead.  And no one could buy or sell anything without that mark, which was either the name of the beast or the number representing his name.  Wisdom is needed to understand this.  Let the one who has understanding solve the number of the beast, for it is the number of a man.  His number is 666. Revelation

And I saw the souls of those who had not worshipped the beast or his statue, nor accepted his mark on their forehead or hand. Revelation

Then a third angel followed them, shouting, “Anyone who worships the beast and his statue or who accepts his mark on the forehead or the hand must drink the wine of God’s wrath.” Revelation