Leviticus 1:9

but he shall wash its entrails and its legs with water. And the priest shall burn all on the altar as a burnt sacrifice, an offering made by fire, a sweet aroma to the LORD.

Surrounding context

1:8 Then the priests, Aaron's sons, shall lay the parts, the head, and the fat in order on the wood that is on the fire upon the altar;

1:9 but he shall wash its entrails and its legs with water. And the priest shall burn all on the altar as a burnt sacrifice, an offering made by fire, a sweet aroma to the LORD.

1:10 "If his offering is of the flocks--of the sheep or of the goats--as a burnt sacrifice, he shall bring a male without blemish.

Translation and sources