Notice the emphatic antithesis:
ἐγώ
and
οἱ
υἱοὶ
ὑμῶν
. The latter (people of your own school; see, in general, note on Mat_8:12) are exorcists who have even pretended actually to cast out demons (Act_19:13; Josephus, Antt. viii. 2. 5, Bell. vii. 6. 3; Justin, c. Tryph. p. 311), who have emanated from the schools of the Pharisees, not the disciples of Jesus, as the majority of the Fathers have supposed. “Quod discipuli vestri daemonia ejiciunt, vos Beelzebuli non attribuitis; illi ergo possunt hac in re judices vestri esse, vos ex virulentia haec de actionibus meis pronuntiare,” Lightfoot. Jesus reasons ex concessis.
αὐτοὶ
(ipsi)
ὑμῶν
are placed together for sake of emphasis.