When the Mohel is ready to perform the circumcision, the baby's father says:
"Behold, I am prepared and ready to perform the positive mitzvah that the Creator has commanded me, may He be blessed, to circumcise my son."
The Mohel then recites:
"Said the Holy One, blessed be He to our father Abraham, Walk before Me and be perfect. Behold, I am prepared and ready to perform the positive mitzvah that the Creator has commanded me, may He be blessed, to circumcise."