'Ark' in the Bible

and the priest shall dip his finger in the blood, and sprinkle it seven times before the Lord, in front of the veil [which screens off the Holy of Holies and the ark of the covenant].

The Lord said to Moses,“Tell Aaron your brother that he must not enter at any time into the Holy Place inside the veil (the Holy of Holies), before the mercy seat which is on the ark, or he will die, for I will appear in the cloud over the mercy seat.

and put the incense on the fire [in the censer] before the Lord, so that the cloud of the incense may cover the mercy seat that is on [the ark of] the Testimony, otherwise he will die.