The ritual of circumcising Jewish boys, that is, removing the foreskin of the penis. This practice derives from God's instruction to Abraham, after which Abraham circumcised himself and later circumcised his son Isaac. It is done to all boys when they reach eight days old (unless a health condition requires a delay) by a professional called a mohel. During the operation, the boy is held by a person (often a grandfather) designated the sandek, which is an honor. Medical anesthetic is not used, but often the baby is given a drop of wine. The ritual is followed by a s'udah, a celebratory meal.