Leviticus 22:27-28 NIV

27 "When a calf, a lamb or a goat1 is born, it is to remain with its mother for seven days.2 From the eighth day3 on, it will be acceptable4 as an offering made to the LORD by fire.

References for Leviticus 22:27

28 Do not slaughter a cow or a sheep and its young on the same day.5

References for Leviticus 22:28