Acts 22:15 in the World English Bible
For you will be a witness for him to all men of what you have seen and heard.
Context
14 And he said, The God of our fathers hath chosen thee, that thou shouldest know his will, and see that Just One, and shouldest hear the voice of his mouth.
15 For thou shalt be his witness unto all men of what thou hast seen and heard.
16 And now why tarriest thou? arise, and be baptized, and wash away thy sins, calling on the name of the Lord.