The Foundations And Concepts of Islam
"And We created not the heaven and the earth and all that is between them without purpose! That is the assumption of those who disbelieve! Then woe to those who disbelieve (in Islaamic Monotheism) from the Fire."
All wise men testify to the necessity of belief in the Last Day; for that's what the intelligence and reason necessitate and what the sound human nature agrees to. When man believes in the Day of Resurrection, he knows why he should abstain from what he is ordered to leave and do what he is ordered to do, hoping for what is with Allaah. He will also know that, he who does injustice to people will inevitably have his recompense and that those he wrongs will take revenge on him on the Day of Resurrection. He will also know that man must have a reward: good reward for good deeds and commensurate punishment for evil deeds, so that each soul shall be rewarded for what it strived for and Divine Justice can be established. Allaah says,
"So whoever does an atom weight of good shall see it; and whoever does an atom weight of evil shall see it."
No one among mankind knows when the Day of Resurrection will come. This is a Day that is known to neither a sent Prophet nor a favoured Angel. Allaah keeps the knowledge of that to Himself alone. He says,
"They ask you about the Hour (Day of Resurrection): 'When will be its appointed time?' Say: 'The Knowledge thereof is with my Lord. None can reveal its time but He.' "
He also says,
"Verily, with Allaah is the knowledge of the Hour."
Six: Belief in Predecree
You must believe that Allaah knows what happens and what shall happen; that He knows the conditions, deeds, life spans and provisions of His slaves. He says,
"Verily, Allaah is All-Knower of everything."