Tattoos and cuttings on the body are forbidden by God:
“You are the children of the LORD your God; you shall not cut yourselves nor shave the front of your head for the dead” (Deut. 14:1)
“You shall not shave around the sides of your head, nor shall you disfigure the edges of your beard. You shall not make any cuttings in your flesh for the dead, nor tattoo any marks on you: I am the LORD” (Lev. 19:27-28)
“I beseech you therefore, brethren, by the mercies of God, that you present your bodies a living sacrifice, holy, acceptable to God, which is your reasonable service. And do not be conformed to this world, but be transformed by the renewing of your mind, that you may prove what is that good and acceptable and perfect will of God” (Rom. 12:1-2)
“And the LORD said to Moses, ‘Speak to the priests, the sons of Aaron, and say to them: ... They shall not make any bald place on their heads, nor shall they shave the edges of their beards nor make any cuttings in their flesh’” (Lev. 21:1,5)