Allah tells His Prophet :

﴿وَيَسْتَعْجِلُونَكَ بِالْعَذَابِ﴾

(And they ask you to hasten on the torment!) meaning, these disbelievers who disbelieve in Allah and His Book and His Messenger and the Last Day. This is like the Ayat:

﴿وَإِذْ قَالُواْ اللَّهُمَّ إِن كَانَ هَـذَا هُوَ الْحَقَّ مِنْ عِندِكَ فَأَمْطِرْ عَلَيْنَا حِجَارَةً مِّنَ السَّمَآءِ أَوِ ائْتِنَا بِعَذَابٍ أَلِيمٍ ﴾

(And (remember) when they said: "O Allah! If this is indeed the truth from You, then rain down stones on us from the sky or bring on us a painful torment.'') ﴿8:32﴾ H

﴿وَقَالُواْ رَبَّنَا عَجِّل لَّنَا قِطَّنَا قَبْلَ يَوْمِ الْحِسَابِ ﴾

(They say: "Our Lord! Hasten to us Qittana (our punishment) before the Day of Reckoning!'') ﴿38:16﴾.

﴿وَلَن يُخْلِفَ اللَّهُ وَعْدَهُ﴾

(And Allah fails not His promise.) means, His promise to bring about the Hour and wreak vengeance upon His enemies, and to honor His close friends.

﴿وَإِنَّ يَوْماً عِندَ رَبِّكَ كَأَلْفِ سَنَةٍ مِّمَّا تَعُدُّونَ﴾

(And verily a day with your Lord is as a thousand years of what you reckon. ) means, He does not hasten, for what is counted as a thousand years with His creation is as one day with Him, and He knows that He is able to exact revenge and that He will not miss a thing, even if He delays and waits and postpones. Hence He then says:

﴿وَكَأَيِّن مِّن قَرْيَةٍ أَمْلَيْتُ لَهَا وَهِىَ ظَـلِمَةٌ ثُمَّ أَخَذْتُهَا وَإِلَىَّ الْمَصِيرُ ﴾

(And many a township did I give respite while it was given to wrongdoing. Then I seized it (with punishment). And to Me is the (final) return (of all).) Ibn Abi Hatim recorded from Abu Hurayrah that the Messenger of Allah said:

«يَدْخُلُ فُقَرَاءُ الْمُسْلِمِينَ الْجَنَّةَ قَبْلَ الْأَغْنِيَاءِ بِنِصْفِ يَوْمٍ خَمْسِمِائَةِ عَام»

(The poor among the Muslims will enter Paradise half a day before the rich -- five hundred years.) This was recorded by At-Tirmidhi and An-Nasa'i from the Hadith of Ath-Thawri from Muhammad bin `Amr. At-Tirmidhi said, "Hasan Sahih.'' Abu Dawud recorded at the end of Book of Al-Malahim in his Sunan from Sa`d bin Abi Waqqas that the Prophet said:

«إِنِّي لَأَرْجُو أَنْ لَا تَعْجِزَ أُمَّتِي عِنْدَ رَبِّهَا أَنْ يُؤَخِّرَهُمْ نِصْفَ يَوْم»

(I hope that it will not be too much for my Ummah if Allah delays them for half a day.) It was said to Sa`d, "What does half a day mean'' He said, "Five hundred years.''

﴿قُلْ يأَيُّهَا النَّاسُ إِنَّمَآ أَنَاْ لَكُمْ نَذِيرٌ مُّبِينٌ - فَالَّذِينَ ءَامَنُواْ وَعَمِلُواْ الصَّـلِحَـتِ لَهُمْ مَّغْفِرَةٌ وَرِزْقٌ كَرِيمٌ - وَالَّذِينَ سَعَوْاْ فِى ءَايَـتِنَا مُعَـجِزِينَ أُوْلَـئِكَ أَصْحَـبُ الْجَحِيمِ ﴾

(49. Say: "O mankind! I am (sent) to you only as a plain warner.'') (50. So those who believe and do righteous good deeds, for them is forgiveness and Rizq Karim.) (51. But those who strive against Our Ayat to frustrate them, they will be dwellers of the Hellfire.)