Positive commandment · Mitzvat Aseh #215 of 613
To circumcise a son
למול את הבן
The verse · Vayikra 12:3
וּבַיּוֹם הַשְּׁמִינִי יִמּוֹל בְּשַׂר עׇרְלָתוֹ
“And on the eighth day the flesh of his foreskin shall be circumcised.”
The Rambam’s words
To circumcise a son, as [Leviticus 12:3] states: "On the eighth day, the flesh of his foreskin shall be circumcised." 7:6.)
למול את הבן, שנאמר: "וביום השמיני ימול בשר ערלתו" (ויקרא יב, ג).
Why · Sefer HaChinuch #2
Circumcise
“It is from the roots of this commandment [that it is] because G-d wanted to establish in His nation, that He separated to be called by His name, a permanent sign on their body; to separate them from the other nations in the form of their bodies just like they are separated from them in the form of their souls, the going out and coming in of which are not similar.”
Who & when
“And [it] is practiced in every place and at all times.”
Where in the Mishneh Torah
Hilchot Forbidden Intercourse הלכות איסורי ביאה