The stone shall cry out of the wall, and the beam out of the timber shall answer it - This appears to refer to the ancient mode of building walls; two or three courses of stone. and then one course of timber. See 1 Kings 6:36; : thus was the palace of Solomon built. The splendid and costly buildings of Babylon have been universally celebrated. But how were these buildings erected? By the spoils of conquered nations, and the expense of the blood of multitudes; therefore the stones and the timber are represented as calling out for vengeance against this ruthless conqueror.
For the stone shall cry out of the wall, and the beam out of the timber shall answer it - All things have a voice, in that they are. God‘s works speak that, for which He made them Psalm 19:1: “The heavens declare the glory of God.” Psalm 65:13: “the valleys are clad with corn, they laugh, yea, they sing;” their very look speaks gladness. Cyril: “For the creation itself proclaims the glory of the Maker, in that it is admired as well made. Wherefore there are voices in things, although there are not words.” Man‘s works speak of that in him, out of which and for which he made them. Works of mercy go up for a memorial before God, and plead there; great works, performed amid wrong and cruelty and for man‘s ambition and pride, have a voice too, and cry out to God, calling down His vengeance on the oppressor. Here the stones of the wall, whereby the building is raised, and the beam, the tye-beam, out of the timber-work wherewith it is finished, and which, as it were, crowns the work, join, as in a chorus, answering one another, and in a deep solemn wailing, before God and the whole world, together chant “Woe, Woe.” Did not the blood and groans of men cry out to God, speechless things have a voice to appeal to Him (See Luke 19:40). Against Belshazzar the wall had, to the letter, words to speak.
Each three verses forming one stanza, as it were, of the dirge, the following words are probably not directly connected with the former, as if the woe, which follows, were, so to speak, the chant of these inanimate witnesses against the Chaldaeans; yet they stand connected with it. The dirge began with woe on the wrongful accumulation of wealth from the conquered and oppressed people: it continues with the selfish use of the wealth so won.