Leviticus 16:12-14

12He shall take a censer full of burning coals from the [bronze] altar before the Lord, and two handfuls of finely ground sweet incense, and bring it inside the veil [into the Most Holy Place],

13and put the incense on the fire [in the censer] before the Lord, so that the cloud of the incense may cover the mercy seat that is on [the ark of] the Testimony, otherwise he will die.

14He shall take some of the bull’s blood and sprinkle it with his finger on the east side of the mercy seat; also in front of the mercy seat he shall sprinkle some of the blood with his finger seven times.