The Calling of Saints Peter and Andrew is a painting by the Italian Baroque master Caravaggio. It takes its theme from a passage in the Gospel of Matthew describing the moment when Christ called the two brothers Simon – later known as Peter – and Andrew, to be his disciples:
As Jesus walked by the Sea of Galilee, he saw two brothers, Simon, who is called Peter, and Andrew his brother, casting a net into the sea – for they were fishermen. And he said to them, “Follow me, and I will make you fishers of men.” Immediately, they left their nets and followed him. Matthew 4:18–20
From Wikipedia