Halakhah for Chullin 161:17

That is that we were commanded that any animal sacrifice that we offer be eight days old or more - and not less. And this is [the commandment of] that which is lacking time in its body. And that is His saying, "it shall stay seven days with its mother" (Leviticus 22:27). And this commandment has already been repeated with a different language. And that is His, may He be exalted, saying, "seven days it shall stay with its mother" (Exodus 22:29). And this commandment completely includes all of the sacrifices. And there is a proof that it is not accepted before then from His saying, "and from the eighth day, it will be accepted as a burnt-sacrifice to the Lord" (Leviticus 22:27). Behold the prohibition of offering that which is lacking time has already been demonstrated. However it is a negative commandment derived from a positive commandment. Hence we do not give lashes for it. So one who sacrifices [an animal] which is lacking time does not receive lashes, as it is explained in the chapter [entitled] Oto ve'et Beno (Chullin 80b). And there, it is said, "Leave that which is lacking time, as Scripture rectified it by a positive commandment." And the regulations of this commandment have already been explained in the Sifrei and at the end of Tractate Zevachim. (See Parashat Emor; Mishneh Torah, Things Forbidden on the Altar 3).