Allah tells His Prophet:

meaning, the disbelievers of the Quraysh, such as Abu Jahl and his like.

means, they make fun of you and insult you, saying,

{"Is this the one who talks about your gods?"} meaning, is this the one who insults your gods and ridicules your intelligence? Allah says:

meaning, they disbelieve in Allah and yet they mock the Messenger of Allah. As Allah says:

{And when they see you, they treat you only in mockery (saying): "Is this the one whom Allah has sent as a Messenger? He would have nearly misled us from our gods, had it not been that we were patient and constant in their worship!" And they will know, when they see the torment, who it is that is most astray from the path!} [25:41-42]

{Mati is created of haste.} This is like the Ayah:

{and man is ever hasty} [17:11], in all matters. The reason why the haste of man is mentioned here is that when mention is made of those who mock the Messenger, (the believers) will want to avenge them swiftly, and that so should happen sooner. Allah says,

{Man is created of haste.} because He delays (the punishment) until a time when, once He seizes him, He will never let him go. He delays it, then He hastens it; He waits, then He does not delay any longer. So He says:

meaning, ‘My vengeance and My punishment of those who oppose Me and disbelieve in My Messengers.’