Verily, We have sent to you (O men) a Messenger (Muhammad SAW) to be a witness over you, as We did send a Messenger [Musa (Moses)] to Fir’aun (Pharaoh).
But Fir’aun (Pharaoh) disobeyed the Messenger [Musa (Moses)], so We seized him with a severe punishment.
Chapter 73 Al-Muzammil : Verses 15-16
Your Messenger is like the Messenger to Fir`awn, and You know what happened to Fir`awn
Allah addresses the disbelievers of the Quraysh, and along with them the rest of mankind,
(Verily, We have sent to you a Messenger to be a witness over you,) meaning, witnessing your deeds.
(as We did send a Messenger to Fir`awn. But Fir`awn disobeyed the Messenger; so We seized him with a severe punishment.)
(severe punishment) Ibn Abbas, Mujahid, Qatadah, As-Suddi, and Ath-Thawri said that this means severe. This means, `you should beware of denying this Messenger, lest you be afflicted by that which befell Fir`awn. Allah seized him with the seizing of One Mighty and Powerful.’ This is as Allah says,
(So Allah seized him with punishment for his last and first transgression.) (79:25) `Therefore, you will be even more deserving of destruction and ruin if you deny your Messenger, because your Messenger is more noble and a greater than Prophet Musa, the son of `Imran.’ This has been reported from Ibn `Abbas and Mujahid.