The comma should have been placed after "today" for the correct meaning.
καὶ εἶπεν αὐτῷ ὁ Ἰησοῦς, Ἀμήν λέγω σοι σήμερον, μετ' ἐμοῦ ἔσῃ ἐν τῷ παραδείσῳ
Literal rendering of the Greek : And said to him Jesus, Truly I say to you today, with me you will be in Paradise.
Jesus could not possibly...