It is presumed by Jewish scholars that the removal of the foreskin symbolically represents such a sealing of the covenant.
The Feast of the Circumcision of Christ is kept as a feast eight days after Nativity in a number of churches including the Eastern Orthodox Church, Catholic Church, Lutheran and some Anglican Communion churches.
12 And he that is eight days old shall be circumcised among you, every male throughout your generations, he that is born in the house, or bought with money of any foreigner, that is not of thy seed.
After the ceremony, a celebratory meal takes place.
Today, as in the time of Abraham, it is required of converts in Orthodox, Conservative and Reform Judaism. As found in Genesis 17:1–14, brit milah is considered to be so important that should the eighth day fall on the Sabbath, actions that would normally be forbidden because of the sanctity of the day are permitted in order to fulfill the requirement to circumcise.
The Talmud, when discussing the importance of Milah, compares it to being equal to all other mitzvot (commandments) based on the gematria for brit of 612 (Tractate Nedarim 32a).
However, if the baby is born on Sunday night after sunset, the Brit is on the following Monday.
The brit takes place on the eighth day following birth even if that day is Shabbat or a holiday.