Leviticus 9:14
And he did wash the inwards and the legs, and burnt them upon the burnt offering on the altar.
Cross-reference
Leviticus 8:21
Parallel
In Leviticus 8:21, washing entrails and legs was done for the ordination ram; here the same action is performed for the burnt offering.
Leviticus 1:9
Parallel
In Leviticus 1:9, washing entrails and legs and burning them is explicitly commanded; Aaron carries out that exact instruction here.
Exodus 29:17
Parallel
Exodus 29:17 prescribes washing entrails and legs for the ordination ram; Aaron enacts the same procedure here.