Leviticus 16:13; Leviticus 24:3

13 "He shall put the incense on the fire before the LORD , that the cloud of incense may cover the mercy seat that is on the ark of the testimony, otherwise he will die.

3 "Outside the veil of testimony in the tent of meeting, Aaron shall keep it in order from evening to morning before the LORD continually; it shall be a perpetual statute throughout your generations.