NET
21 Then the experts in the law and the Pharisees began to think to themselves, “Who is this man who is uttering blasphemies? Who can forgive sins but God alone?”
Darby
21 And the scribes and the Pharisees began to reason [in their minds], saying, Who is this who speaks blasphemies? Who is able to forgive sins but God alone?
KJV
21 And the scribes and the Pharisees began to reason, saying, Who is this which speaketh blasphemies? Who can forgive sins, but God alone?