John Gill Commentary Luke 11:17

"But he, knowing their thoughts, said unto them, Every kingdom divided against itself is brought to desolation; and a house [divided] against a house falleth." — Luke 11:17 (ASV)

But he knowing their thoughts
Being God omniscient,

said unto them ;
the following parables, as they are called in (Mark 3:23) or proverbial expressions, very pertinent to the purpose, and sufficient to set aside the base calumnies of the Pharisees:

every kingdom divided against itself, is brought to desolation ;
in process of time, division will end in destruction; and as it does in the kingdoms of the world, of which there have been fatal instances, so it would in the kingdom of Satan, was there in it a division, which the calumny of the Pharisees supposes:

and an house divided against an house, falleth .
The Persic version renders it, "an house divided from the foundation, falls"; the sense is, a family, in which one part is opposed to the other, issues in the ruin of both; (See Gill on Matthew 12:25), (See Gill on Mark 3:24), (See Gill on Mark 3:25).