Exodus 40:3, 21

You shall place the ark of the Testimony there, and you shall screen off the ark [from the Holy Place of God’s Presence] with the veil (partition curtain). [Heb 10:19-23]

Moses brought the ark into the tabernacle, and set up a veil (partition) for the screen (curtain), and screened off the ark of the Testimony, just as the LORD had commanded him.