John Gill Commentary Exodus 40:26

"And he put the golden altar in the tent of meeting before the veil:" — Exodus 40:26 (ASV)

And he put the golden altar
The altar of incense; so called because it was overlaid with gold, and to distinguish it from the altar of burnt offering, which was covered with brass: to this altar there is an allusion in (Revelation 8:3)

in the tent of the congregation, before the vail ;
in the same place, the holy place, where the shewbread table and candlestick were, and these were all the furniture of it; and this was put, not within the vail, but before it, over against the ark, as that stood within it, (Exodus 40:5) .