When Aaron sets up the lamps at twilight, he must burn the incense perpetually before the LORD for the generations to come.

Exodus 27:21
In the Tent of Meeting, outside the veil that is in front of the Testimony, Aaron and his sons are to tend the lamps before the LORD from evening until morning. This is to be a permanent statute for the Israelites for the generations to come.

Exodus 30:7
And Aaron is to burn fragrant incense on it every morning when he tends the lamps.

Exodus 30:9
On this altar you must not offer unauthorized incense or a burnt offering or grain offering; nor are you to pour a drink offering on it.

1 Samuel 2:28
And out of all the tribes of Israel I selected your father to be My priest, to offer sacrifices on My altar, to burn incense, and to wear an ephod in My presence. I also gave to the house of your father all the offerings of the Israelites made by fire.

2 Chronicles 26:18
They took their stand against King Uzziah and said, "Uzziah, you have no right to offer incense to the LORD. Only the priests, the descendants of Aaron, are consecrated to burn incense. Leave the sanctuary, for you have acted unfaithfully; you will not receive honor from the LORD God."

Psalm 141:2
May my prayer be set before You like incense, my uplifted hands like the evening offering.

And when Aaron lights the lamps at even, he shall burn incense on it, a perpetual incense before the LORD throughout your generations.