Circumcision
Circumcision is very important to most branches of Judaism, with over 90% of male adherents having the procedure performed as a religious obligation. The basis for its observance is found in the Torah of the Hebrew Bible, in Genesis chapter 17, in which a covenant of circumcision is made with Abraham and his descendants. Jewish circumcision is part of the "brit milah" ritual, to be performed by a specialist ritual circumciser, a "mohel", on the eighth day of a newborn son's life, with certain exceptions for poor health. Jewish law requires that the circumcision leaves the glans bare when the penis is flaccid. Converts to Conservative and Orthodox Judaism must also be circumcised; those who are already circumcised undergo a symbolic circumcision ritual. Circumcision is not required by Judaism for one to be considered Jewish, but some adherents foresee serious negative spiritual consequences if it is neglected.
Khitan (circumcision)
Whereas Jewish circumcision is closely bound by ritual timing and tradition, in Islam there is no fixed age for circumcision. The age when boys get circumcised, and the procedures used, tend to change across cultures, families, and time. In some Muslim-majority countries, circumcision is performed on Muslim boys after they have learned to recite the whole Qur'an from start to finish. In Malaysia and other regions, the boy usually undergoes the operation between the ages of ten and twelve, and is thus a puberty rite, serving to introduce him into the new status of an adult. The procedure is sometimes semi-public, accompanied with music, special foods, and much festivity.