How do we know that Jesus cast out demons by the power of God?

The evidence of Jesus casting out demons by the power of God is substantiated through the synoptic Gospels where His miracles are recorded. In Luke 11, when accused of casting out demons by Beelzebub, Jesus responds that a kingdom divided against itself cannot stand, asserting that if He casts out demons by the finger of God, then the Kingdom of God has come upon them. Miracles performed by Jesus serve as affirmations of His divine identity and mission. Additionally, Acts 2:22 states that Jesus was attested by God through miracles, wonders, and signs, establishing that His works were not merely acts of power but manifestations of God's salvific will through Him.