27:21In the tabernacle of the congregation without the vail, which is before the testimony, Aaron and his sons shall order it from evening to morning before the LORD: it shall be a statute for ever unto their generations on the behalf of the children of Israel.

30:7And Aaron shall burn thereon sweet incense every morning: when he dresseth the lamps, he shall burn incense upon it.

30:8And when Aaron lighteth the lamps at even, he shall burn incense upon it, a perpetual incense before the LORD throughout your generations.