Translation:

15. We have sent to you (O men!) an apostle to be a witness concerning you even as We sent an apostle to Pharaoh.

Notes (Tafseer)

5767. Our holy Prophet has to warn his age, i.e., the present age, reclaim it from sin, and be a witness for the righteous and against evil, as Moses did his office in his age. For Pharaoh, his arrogance, and his punishment, see x. 75-92.