Leviticus 16:11-14

Thus shall Aaron offer his bull for the purification offering, to make atonement for himself and for his family. When he has slaughtered it, he shall take a censer full of glowing embers from the altar before the LORD, as well as a double handful of finely ground fragrant incense, and bringing them inside the veil, there before the LORD he shall put incense on the fire, so that a cloud of incense may shield the cover that is over the covenant, else he will die. Taking some of the bull’s blood, he shall sprinkle it with his finger on the front of the ark’s cover and likewise sprinkle some of the blood with his finger seven times in front of the cover.