Leviticus 1:16

1:16 Then the priest must remove its entrails by cutting off its tail feathers, and throw them to the east side of the altar into the place of fatty ashes,

Leviticus 16:14

16:14 Then he is to take some of the blood of the bull and sprinkle it with his finger on the eastern face of the atonement plate, and in front of the atonement plate he is to sprinkle some of the blood seven times with his finger.