Leviticus 6:1-3

¹And the Lord spake with Mosheh, saying:

²Instruct Aharon and his sons, saying: This is the law of the Burnt Offering. It is burnt offering, because burned upon the altar all night until morning, and the fire of the altar shall be burning in it.

³And the priest shall dress himself with the vestments of linen, and wear drawers of linen upon his flesh; and he shall separate the ashes which the fire hath consumed with the burnt offering upon the altar, and set them beside the altar.