The Holy Place and Most Holy Place, or Holy of Holies were the two sections of the tabernacle and later Temple. A curtain divided them. Priests served in the Holy Place daily, but the high priest went behind the curtain just once a year, on Yom Kippur, the Day of Atonement. In Hebrews 9 the author tells us that this structure and practice, as long as they remained, restricted access to God, and could not cleanse our conscience nor deal with sin. The good news is Jesus' death and resurrection tears the curtain in two and gives us free access to God, by grace through faith.