Ablution of Burnt offerings
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Leviticus 1:9, 13
The entrails and legs must be washed with water, and the priest shall burn all of it on the altar as a burnt offering, an offering made by fire, a pleasing aroma to the LORD. / The entrails and legs must be washed with water, and the priest shall bring all of it and burn it on the altar; it is a burnt offering, an offering made by fire, a pleasing aroma to the LORD.
Leviticus 9:14
He washed the entrails and the legs and burned them atop the burnt offering on the altar.
2 Chronicles 4:6
He also made ten basins for washing and placed five on the south side and five on the north. The parts of the burnt offering were rinsed in them, but the priests used the Sea for washing.