'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.

(Посилання: Apocalypse Explained 644)

9524. 'Which are over the ark of the Testimony' means with the Lord in heaven. This is clear from the representation of 'the ark' as heaven, and from the meaning of 'the Testimony' as Divine Truth, thus the Lord in heaven, both dealt with in 9503.