Jesus has authority over demons and evil spirits

Scripture reference

Mark 5:1–20 (ASV)

And they came to the other side of the sea, into the country of the Gerasenes. 2And when he was come out of the boat, straightway there met him out of the tombs a man with an unclean spirit, 3who had his dwelling in the tombs: and no man could any more bind him, no, not with a chain; 4because that he had been often bound with fetters and chains, and the chains had been rent asunder by him, and the fetters broken in pieces: and no man had strength to tame him. 5And always, night and day, in the tombs and in the mountains, he was crying out, and cutting himself with stones. 6And when he saw Jesus from afar, he ran and worshipped him; 7and crying out with a loud voice, he saith, What have I to do with thee, Jesus, thou Son of the Most High God? I adjure thee by God, torment me not. 8For h...

Stories

When Amy Carmichael was told that a man living nearby was possessed by a demon, before going to pray with him, she prayed and fasted with her friend and on arriving at the scene prayed in the name of Jesus for his deliverance. It took a while, and just when she was regretting her coming, she heard the Lord and eventually the man was free and free indeed.
Violent opposition to their work in Samerng had forced Art and his team to leave the town. But before leaving, they gathered to ask, "Lord, where should we go?" And before they were done praying, God had answered their prayer!