Exodus 40:6

And thou shalt set the altar of the burnt offering before the door of the tabernacle of the tent of the congregation.

Cross-reference

Exodus 40:29 records Moses setting the altar of burnt offering at the door, directly fulfilling the command in Exodus 40:6.

Exodus 27:1-8 gives the detailed instructions for building this same bronze altar that is now being placed at the tabernacle entrance.

Exodus 38:1-7 records the actual construction of the altar, matching the command here to put it in place.

2 Kings 16:14 records King Ahaz moving the bronze altar, directly referencing this altar's history.