VI.i.3. (Also in III.36) One of the fathers said, “Once when some of the seniors were gathered together and talking about serious matters, one of them who was a seer was aware of angels stretching out their hands to anoint them. But when the talk went on to aimless worldly matters the angels departed and foul-smelling swine cavorted about polluting them. When the talk returned again to wholesome subjects the angels returned and anointed them.
De Vitis Patrum Volume VI.