Exodus 12:9

12:9 Do not eat it raw ¹  or boiled in water, but roast it over the fire with its head, its legs, and its entrails.

Exodus 29:15

29:15 “You are to take one ram, and Aaron and his sons are to lay their hands on the ram’s head,

Exodus 29:17

29:17 Then you are to cut the ram into pieces and wash the entrails and its legs and put them on its pieces and on its head

Exodus 29:19

29:19 “You are to take the second ram, and Aaron and his sons are to lay their hands on the ram’s head,

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¹ sn This ruling was to prevent their eating it just softened by the fire or partially roasted as differing customs might prescribe or allow.