peria

Jewish law determined that circumcision includes two procedures, one that involves mila 'incision,' a vertical cut made along the fore-skin; and the other peri'a 'uncovering,' folding out the foreskin, unveiling thereby the corona. Both procedures are absolutely necessary. Categorically, the law declares that without peri'a the circumcision is invalid.

1986, Jose Faur, Golden Doves with Silver Dots

2018 David Borsky Laws of Conversion and Circumcision - Lesson 12 Metzitza Ba-peh One of the most controversial aspects of brit mila is the metzitza ba-peh. As we shall see, the Talmud (Shabbat 133a) mentions metzitza ba-peh, oral suction, as one of the three stages of the ritual circumcision. Following the mila and peria, the mohel places his mouth directly on the wound to draw blood out from the cut. This mishna presents the stages of ritual circumcision — mila, peria and metzitza — and teaches that all three stages are permitted on Shabbat. The Rishonim disagree as to whether one who has already removed the membrane (peria), but not yet performed metzitza, may still continue to cut the skin which is not integral to the brit mila (tzitzin she-einan me’akkevin). May the Compassionate One bless the one who cut the flesh of the foreskin (mila), split the membrane (peria) and drew off the blood of the circumcision (metzitza).