Who has been sent as a real blessing for the people of the world?

Verse 107 of Chapter 21

And We have not sent you (O Muhammad) but as a mercy to the worlds.

Verse 1 of Chapter 25
Blessed be He Who sent down the criterion to His servant that he may be a warner to all nations.

Verse 21 of Chapter 33

Certainly you have in the Messenger of Allah an excellent exemplar for him who hopes in Allah and the latter day and remembers Allah much.

Verse 40 of Chapter 33

Muhammad is not the father of any of your men, but (he is) the Messenger of Allah, and the Seal of the Prophets: and Allah has full knowledge of all things.

Verses 45-48 of Chapter 33

O Prophet, We have sent you as a witness, a bearer of good news and a warner, an inviter to Allah by His leave and a luminous lamp. Give good news to those who have believed (in you) that there are great bounties in store for them from Allah, so do not yield to the disbelievers and the hypocrites, disregard their persecution and put your trust in Allah: for Allah is sufficient for being entrusted with all one's affairs.

Verse 28 of Chapter 34

And (O Prophet,) We have sent you to the entire mankind as a bearer of good news and a warner, but most people do not know.