It was narrated 'Abdullah bin 'Umar said : The poor Muhajireen complained to the Messenger of Allah about that with which Allah had favored the rich over them. He said:O poor people, shall I not give you the glad tidings that the poor believers will enter Paradise half a day, five hundred years, before the rich?'" (Da'if)
Then (one of the narrators) Musa recited this Verse: And verily, a day with your Lord is as a thousand years of what you reckon.