Authority to forgive sins

Matthew 9:4-6
[4]Jesus perceived what they were thinking, so he said, “Why are you thinking such evil things?
[5]Is it easier to say, ‘Your sins are forgiven,’ or to say, ‘Get up and walk’?
[6]I will prove to you, then, that the Son of Man has authority on earth to forgive sins.” So he said to the paralysed man, “Get up, pick up your bed, and go home!”