What does scripture say?
Leviticus 19:28
You shall not make any cuttings in your flesh, for the dead, neither shall you make in yourselves any figures or marks: I am the Lord
Deuteronomy 14:1-2
Be ye children of the Lord your God: you shall not cut yourselves, nor make any baldness for the dead; Because thou art a holy people to the Lord thy God: and he chose thee to be his peculiar people of all nations that are upon the earth.
Corinthians 6:19-20
Or know you not, that your members are the temple of the Holy Ghost, who is in you, whom you have from God; and you are not your own? For you are bought with a great price. Glorify and bear God in your body.