Berean Standard Bible (BSB)
You will be His witness to everyone of what you have seen and heard.
World English Bible (WEB)
For you will be a witness for him to all men of what you have seen and heard.
Strong's King James
For{G3754} thou shalt be{G2071}{(G5704)} his{G846} witness{G3144} unto{G4314} all{G3956} men{G444} of what{G3739} thou hast seen{G3708}{(G5758)} and{G2532} heard{G191}{(G5656)}.
The F.O.G *
(15) Because you'll be a witness for Him to all mankind of what you've seen and heard.
The F.O.G Message *
Young's Literal Translation
because thou shalt be his witness unto all men of what thou hast seen and heard;