Allah tells His Prophet :

meaning, these disbelievers who disbelieve in Allah and His Book and His Messenger and the Last Day. This is like the Ayat:

{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]

{They say: "Our Lord! Hasten to us Qittana (our punishment) before the Day of Reckoning!"} [38:16].

{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.

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:

Ibn Abi Hatim recorded from Abu Hurayrah that the Messenger of Allah said:

«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:

«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."