Altar of Incense: Placed Before the Vail in the Outer Sanctuary
Source: TTT
Exodus 30:6
Place the altar in front of the veil that is before the ark of the Testimony—before the mercy seat that is over the Testimony—where I will meet with you.
Exodus 40:5, 26
Place the gold altar of incense in front of the ark of the Testimony, and hang the curtain at the entrance to the tabernacle. / Moses placed the gold altar in the Tent of Meeting, in front of the veil,