'Most Holy Place' in the Bible

and Yahweh said to Moses, "Tell Aaron your brother, not to come at all times into the Most Holy Place within the veil, before the mercy seat which is on the ark; lest he die: for I will appear in the cloud on the mercy seat.

and purify the most holy place. He will purify the tent of meeting and the altar and will make atonement for the priests and all the people of the assembly.

Outside the veil of the Testimony [between the Holy Place and the Most Holy Place] in the Tent of Meeting, Aaron shall always keep the lamps burning before the Lord from evening until morning; it shall be a permanent statute throughout your generations.