יחזקאל מא:כה פירוש: רש״י

and a wooden beam before the Hall [Heb. וְעָב,] tref in Old French. Poles of cedar wood were attached from the wall of the Heichal to the wall of the Hall so that it should not slant down. So we learned in Tractate Middoth (3:8): And a beam projected from the wall of the House and came to the outside facade of the Hall.