Al-e-Imran (The House of Imran) Sura 3: Verse 145
"No soul can die except by Allah's leave according to a prescribed term. If any do desire a reward in this life, We shall give it to him; and if any do desire a reward in the hereafter, We shall give it to him. And swiftly shall We reward those who (serve Us with) gratitude."
In this verse, two weaknesses of the weaker elements in the Muslim community and the hypocrites are pointed out. One, they do not believe that the time of death of every person is fixed and that no one will die before the completion of the prescribed term of life, and that once this term is over, no one will be able to avert death even for a single instant. Therefore, a person's first concern should be to faithfully, firmly and resolutely discharge his obligations towards Allah rather than fleeing from them. The time and manner of every person's death is already fixed and cannot be altered.