Matthew 12:27 - Ellicott's Commentary On The Whole Bible

By whom do your children cast them out? — The “children” of the Pharisees are their disciples, and in this case, such as practised exorcism, like the sons of Sceva in Acts 19:13. The belief in demoniacal possession had as its natural accompaniment the claim on the part of those who could control the disordered reason of the possessed person of power to cast out the demon. We need not assume that such power was always a pretence, or rested only on spells and incantations. Earnestness, prayer, fasting, faith — these are always mighty in intensifying the power of will, before which the frenzied soul bows in submission or yields in confidence, and these may well have been found among the better and truer Pharisees. Our Lord’s question, indeed, requires for its logical validity the admission that the “children” of the accusers did really cast out demons, and that not by Beelzebub.