A.T. Robertson Commentary Luke 11:18

"And if Satan also is divided against himself, how shall his kingdom stand? because ye say that I cast out demons by Beelzebub." — Luke 11:18 (ASV)

Because ye say (οτ λεγετε). Jesus here repeats in indirect discourse (accusative and infinitive) the charge made against him in verse 15. The condition is of the first class, determined as fulfilled.