1 Kings 6:5 - Joseph Benson’s Commentary on the Old and New Testaments

Against the wall of the house he built chambers For the accommodation of the priests, when they were upon duty at the temple. Here they kept their clothes, the sacred vessels not in immediate use, and the treasures belonging to the temple. These chambers are said to have been built against or adjoining to the wall; for their beams were not fastened into the wall, but leaned upon the buttresses of the wall. Round about On all the sides except the east, where the porch was, and except some very small passages for the light. And yet the lights might be in the five uppermost cubits of the wall, which were above all these chambers, for these were only fifteen cubits high, and the wall was twenty cubits high. And he made chambers round about In the Hebrew, He made ribs; by which some understand galleries, which encompassed all the forenamed chambers, and were necessary for passages to them.