Parallel
Acts 22:15
Nestle 1904 Greek New Testament · Berean Standard Bible
ὅτι ἔσῃ μάρτυς αὐτῷ πρὸς πάντας ἀνθρώπους ὧν ἑώρακας καὶ ἤκουσας
You will be His witness to everyone of what you have seen and heard.