Bar-Jesus is a false prophet whom Paul and Silas met on the island of Paphos.
Acts 13:6When they had gone through the whole island as far as Paphos, they found a Jewish sorcerer, a false prophet named Bar-Jesus.
He appears to have advised the proconsul Sergius Paulus at the time with various divinations and magic.
Acts 13:7He was with the proconsul, Sergius Paulus, an intelligent man. Sergius Paulus sent for Barnabas and Saul and sought to hear the word of God.
In Hebrew, 'Bar' means 'son'. In other words, this man operated under the name Son of Jesus.
His other name is Elymas.
Acts 13:8But Elymas the sorcerer (for so his name is translated) opposed them, seeking to turn the proconsul away from the faith.
When Paul rebuked his false magic, God made him blind.
Acts 13:9Then Saul, who was also called Paul, filled with the Holy Spirit, looked intently at himActs 13:10and said, “You son of the devil, you enemy of all righteousness, full of all deceit and villainy, will you not stop making crooked the straight paths of the Lord?Acts 13:11And now, behold, the hand of the Lord is upon you, and you will be blind and unable to see the sun for a time.” Immediately mist and darkness fell upon him, and he went about seeking someone to lead him by the hand.Acts 13:12Then the proconsul believed when he saw what had occurred, for he was astonished at the teaching of the Lord.