https://thornhillkollel.com/wp-content/uploads/2016/02/shabbos-perek-yud-tes-mishna-4-performing-a-bris-milah-to-a-child-who-is-not-8-dys-old-on-Shabbos.mp3“shabbos perek yud tes mishna 4 performing a bris milah to a child who is not 8 dys old on Shabbos”.