In the following sentence from Wisdom 17:12, intus appears to be used as the object of a preposition:
dum ab intus minor est exspectatio, maiorem computat inscientiam eius causae, quae tormentum praestat.
Is that the case?
If so, how can that be explained gramatically since it's an adverb?
(I don't know of any rule that allows adverbs to be used as objects of prepositions.)