As Jesus walked beside the Sea of Galilee, he saw Simon and his brother Andrew casting a net into the lake, for they were fishermen. “Come, follow me,” Jesus said, “and I will make you fishers of men.” At once they left their nets and followed him. Mark 1:16-18
Andrew, Simon Peter’s brother, was one of the two who heard what John had said and who had followed Jesus. The first thing Andrew did was to find his brother Simon and tell him, “We have found the Messiah” (that is, the Christ). And he brought him to Jesus. John 1:40-42