Gospel According to Mark 2:14-17

2:14 As Jesus went on his way, he saw Levi the son of Alphaeus sitting at his desk in the tax office and he said to him, "Follow me!"

2:15-16 Levi got up and followed him. Later, when Jesus was sitting at dinner in Levi's house, a large number of tax-collectors and disreputable folk came in and joined him and his disciples. For there were many such people among his followers. When the scribes and Pharisees saw him eating in the company of tax-collectors and outsiders, they remarked to his disciples, "Why does he eat with tax-collectors and sinners?"

2:17 When Jesus heard this, he said to them, "It is not the fit and flourishing who need the doctor, but those who are ill. I did not come to invite the 'righteous', but the 'sinners'.