Exodus 40:6

40:6 You are to put the altar for the burnt offering in front of the entrance to the tabernacle, the tent of meeting.

Exodus 40:18-19

40:18 When Moses set up the tabernacle and put its bases in place, he set up its frames, attached its bars, and set up its posts. 40:19 Then he spread the tent over the tabernacle and put the covering of the tent over it, as the Lord had commanded Moses.