'Lowest' in the Bible

The lowest line of them being five cubits wide, the middle six cubits wide and the third seven cubits; for there was a space all round the outside walls of the house so that the boards supporting the rooms did not have to be fixed in the walls of the house.

The door to the lowest side rooms was in the right side of the house; and they went up by twisting steps into the middle rooms, and from the middle into the third.