Genesis
Chapter 17
10
This is my covenant, which ye shall keep, between me and you and thy seed after thee; Every man child among you shall be circumcised.
Albert Venczel's Note
Jun 2
Rabbi's claim this is to remove the female part, as women are not part of the covenant with God. (7 day old babyboy, Rabbi sucks the blood from the penis remove foreskin with rusty blade or shard of glass)
An Occultist interpretation states it means to remove the foreskin of their heart, to lighten up and be of good nature. (soft heart)