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

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

Exod.30.8

And each evening when he tends to the lamps, he must again burn incense in the LORD's presence. This must be done from generation to generation.