Exod.30.8

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

Exod.30.8

and again in the evening as he prepares the lamps for lighting, so that there will always be incense burning before GOD, generation after generation.

Exod.30.8

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.

Exod.30.8

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