R. Yonathan says: The (non) circumcision of his males does not prevent him from eating the Pesach. What, then, is the intent of "let all of his males be circumcised, etc."? If one had before him two mitzvoth — that of Pesach and that of circumcision — I would not know which one should take precedence. "Let all his males be circumcised" tells us that circumcision takes precedence to Pesach.