Exodus 30:6-8 New King James Version (NKJV)
6 And you shall put it before the veil that is before the ark of the Testimony, before the mercy seat that is over the Testimony, where I will meet with you.
7 “Aaron shall burn on it sweet incense every morning; when he tends the lamps, he shall burn incense on it. 8 And when Aaron lights the lamps [a]at twilight, he shall burn incense on it, a perpetual incense before the Lord throughout your generations.
Exodus 30:6-8 New International Version (NIV)
6 Put the altar in front of the curtain that shields the ark of the covenant law—before the atonement cover that is over the tablets of the covenant law—where I will meet with you.
7 “Aaron must burn fragrant incense on the altar every morning when he tends the lamps. 8 He must burn incense again when he lights the lamps at twilight so incense will burn regularly before the Lord for the generations to come.