Mark 4:40

4:40 And he said to them, “Why are you cowardly? Do you still not have faith?”

Mark 11:22

11:22 Jesus said to them, “Have faith in God.

Mark 2:5

2:5 When Jesus saw their ¹  faith, he said to the paralytic, “Son, your sins are forgiven.” ² 

[2:5]  ¹ sn The plural pronoun their makes it clear that Jesus was responding to the faith of the entire group, not just the paralyzed man.

[2:5]  ² sn The passive voice here is a divine passive (ExSyn 437). It is clear that God does the forgiving.