Leviticus 22:27

When a bullock, or a sheep, or a goat, is brought forth, then it shall be seven days under the dam; and from the eighth day and thenceforth it shall be accepted for an offering made by fire unto the Lord.

Cross-reference

Leviticus 12:3 sets circumcision on the eighth day, paralleling the eighth-day acceptance of animal offerings.

Leviticus 12:2 establishes a seven-day purification after childbirth, mirroring the seven-day wait for animal acceptance.

Exodus 22:30 gives the same seven‑day wait and eighth‑day offering for firstborn animals — this verse extends that rule to all acceptable offerings.