“et faciat ei dignam habitationem, et in pariete ponens illud, et confirmans ferro”
“And when he had made a convenient room for it, set it in a wall, and made it fast with iron:”
“And having made for it a chamber worthy of it, He sets it in a wall, making it fast with iron.”
Iron. Baruch (vi. 26.) ridicules the same custom, and the other prophets intimate that the pagans took these statues to be really gods, otherwise their practice was no more blameable than that of the Jews, who fastened the cherubim to the ark with gold, and carried them. But the latter did not believe that the Deity resided personally in those images; no more than we do, that Christ is attached to his image on the cross. This distinguishes the behaviour of the faithful from that of pagans. (Calmet)