Abraham was circumcised on the Day of Atonement, and God looks that day
annually on the blood of the covenant of our father Abraham's
circumcision as atoning for all our iniquities, as it is said in Lev.
xvi. 30, "For on that day shall he make an atonement for you, to cleanse
you from all your sins."
THE TALMUD, _Yalkut Chadash_, fol. 121, col. 1, sec. 3.