Rashi on Genesis 17:23/רש"י על בראשית י״ז:כ״ג

1בעצם היום IN THE SELFSAME DAY — on the very day when he received the command of circumcision: by day and not by night — he was afraid neither of the heathens nor of the cynics. And he did it in broad daylight in order that his enemies and other people should not say, “If we had seen him we would never have allowed him to practise circumcision and carry out the commandment of the Omnipresent (Genesis Rabbah 47:9).

2וימל AND HE CURCUMCISED — This is a Kal form (active).