Exodus 12:21

12:21 Then Moses summoned all the elders of Israel, and told them, “Go and select for yourselves a lamb or young goat for your families, and kill the Passover animals.

Exodus 13:13

13:13 Every firstling of a donkey you must redeem with a lamb, and if you do not redeem it, then you must break its neck. Every firstborn of your sons you must redeem.

Exodus 29:40-41

29:40 With the first lamb offer a tenth of an ephah of fine flour mixed with a fourth of a hin of oil from pressed olives, and a fourth of a hin of wine as a drink offering. 29:41 The second lamb you are to offer around sundown; you are to prepare for it the same meal offering as for the morning and the same drink offering, for a soothing aroma, an offering made by fire to the Lord.