וביום השמיני ימול בשר ערלתו
The eighth day following birth plays a critical role concerning both a human male and a sacrifice. It also is the day that the Kohanim were inducted into service at the Sanctuary. [Aharon and his sons were instructed to wait in the Ohel Moed for seven full days while Moshe Rabbeinu performed the inauguration service. The inauguration service concluded with the induction of Aharon and his sons as Kohanim on the eighth day.] What is so special about the eighth day? Horav Moshe Feinstein, zl, cites the Midrash (Vayikra Rabbah 27:10) which states that both an animal and a human…