(Ibid. 5) "seh": Included in "seh" is a goat and a sheep, viz. (Devarim 14:4) "the seh of the sheep and the seh of the goats." "unblemished": to exclude a blemished animal. "male": to exclude a tumtum (one of indefinite gender), a hermaphrodite, and a female. ... "one year old": This tells me only of a one-year-old. Whence do I derive (the same for) its entire first year? R. Yishmael was wont to say: If a burnt-offering, which is of a high order of sanctity, may be brought its entire year as at the one-year mark itself, how much more so the Paschal lamb, which is of a lower order of sanctity!