Mortar, untempered
'Untempered mortar,' as in Ezekiel 13:11, signifies the confirmation of falsity through fallacies which makes such ideas appear true. 'Stones of hail' represent falsities.
(Reference: Apocalypse Explained 644)
Ezekiel 13:11
11
tell those who plaster it with whitewash, that it shall fall: there shall be an overflowing shower; and you, great hailstones, shall fall; and a stormy wind shall tear it.