Exodus 30:1

Thou shalt make an altar to burn incense upon: . . . and thou shalt put it before the veil that is by the ark of the testimony, before the mercy seat that is over the testimony, where I will meet with thee.

And Aaron shall burn thereon sweet incense every morning: . . . and when Aaron lighteth the lamps at even, he shall burn incense upon it, a perpetual incense before the Lord throughout your generations.