John Wesley on Mark 2:15

Many publicans and notorious sinners sat with Jesus - Some of them doubtless invited by Matthew, moved with compassion for his old companions in sin. But the next words, For there were many, and they followed him, seem to imply, that the greater part, encouraged by his gracious words and the tenderness of his behaviour, and impatient to hear more, stayed for no invitation, but pressed in after him, and kept as close to him as they could.