What does the old testment bible say about piercing the body?

2 do not cut your bodies for the dead or put tattoo marks on yourselves (they were against piercings and tattoos and think that you should not get piercings or tattoos.

in relation to tattoos and body piercings, a good test is to determine whether we can honestly, in good conscience, ask God to bless and uses the particular activity for his own good purposes "so whether you eat or drink or what ever you do, do it for the glory of God and gives us the impression that God would not have any piercings or tattoos !