Jamieson, Fausset and Brown on Ezekiel 41:6

6. might ... hold, but ... not hold in ... wall of the house--1Ki 6:6 tells us there were rests made in the walls of the temple for supports to the side chambers; but the temple walls did not thereby become part of this side building; they stood separate from it. "They entered," namely, the beams of the chambers, which were three-storied and thirty in consecutive order, entered into the wall, that is, were made to lean on rests projecting from the wall.