Exodus 40:3

40:3 You are to place the ark of the testimony in it and shield the ark with the special curtain.

Exodus 40:5

40:5 You are to put the gold altar for incense in front of the ark of the testimony and put the curtain at the entrance to the tabernacle.

Exodus 40:26

40:26 And he put the gold altar in the tent of meeting in front of the curtain,