'Holies' in the Bible

'And thou hast put the vail under the hooks, and hast brought in thither within the vail the ark of the testimony; and the vail hath made a separation for you between the holy and the holy of holies.

'And thou hast put the mercy-seat on the ark of the testimony, in the holy of holies.

Aaron shall wear the robe when he ministers, and its sound shall be heard when he goes [alone] into the Holy Place before the Lord, and when he comes out, so that he will not die there.