If he offer a lamb for his offering
Which was of the flock, and must be of the first year; this is a rule laid down by Maimonides F9, that where ever this word is used in the law, it signifies one of the first year:
then shall he offer it before the Lord;
bring it into the court, and present it to the priest.
F9 Maaseh Hakorbanot, c. 1. sect. 14.