Back 
Surah 7. Al-A'raf
Ayah 57 - 58
57وَهُوَ ٱلَّذِى يُرْسِلُ ٱلرِّيَـٰحَ بُشْرًۢا بَيْنَ يَدَىْ رَحْمَتِهِۦ ۖ حَتَّىٰٓ إِذَآ أَقَلَّتْ سَحَابًا ثِقَالًا سُقْنَـٰهُ لِبَلَدٍ مَّيِّتٍ فَأَنزَلْنَا بِهِ ٱلْمَآءَ فَأَخْرَجْنَا بِهِۦ مِن كُلِّ ٱلثَّمَرَٰتِ ۚ كَذَٰلِكَ نُخْرِجُ ٱلْمَوْتَىٰ لَعَلَّكُمْ تَذَكَّرُونَ
58وَٱلْبَلَدُ ٱلطَّيِّبُ يَخْرُجُ نَبَاتُهُۥ بِإِذْنِ رَبِّهِۦ ۖ وَٱلَّذِى خَبُثَ لَا يَخْرُجُ إِلَّا نَكِدًا ۚ كَذَٰلِكَ نُصَرِّفُ ٱلْـَٔايَـٰتِ لِقَوْمٍ يَشْكُرُونَ
[57-58] And it is Allah, Who sends winds as harbingers of the good tidings of His mercy; when they gather up heavy clouds He drives them on to some dead land, and makes the rain fall upon it and brings forth many kinds of fruit (from the same dead land). Look! This is how We bring forth the dead from the state of death; it may be that you learn a lesson from this observation. The soil which is rich, yields rich produce by Allah's permission and the soil which is poor yields nothing but poor produce.46 Thus We present Our Signs over and over again for those people who intend to be grateful.
46It should be noted here that the allegorical use of rain and its blessings etc. does not only aim to describe the powers of Allah and to give a proof of the life-after-death (though that has been mentioned incidentally). Its main object is to present Prophethood and its blessings, as also how it helps to distinguish good from bad, pure from impure. The coming of the Messenger and the sending down of the Guidance and the teachings have been likened to the winds laden with clouds and the life-giving rainfall. Just as the rainfall brings back to life the dead soil, which begins to bring forth the treasures of life, so the teachings of the Prophet and his guidance bring back to life the dead humanity, which begins to pour out the treasures of goodness. Further on, the allegory points out that all these blessings profit only that soil which is intrinsically rich and fertile, and is only waiting for rainfall to bring forth its treasures. In the same way, only those people can benefit from the blessings of the guidance and teachings of the Messengers, who had the required capability but could not develop their latent qualities for lack of right guidance. As regards the mischievous and impure people, they are incapable of benefiting from the blessings of Prophethood for they are just like the bad soil, which brings forth only useless thorny bushes, if rain falls on it. That is why all their hidden mischiefs come into full play at the coming of the Messenger. The lesson derived from this allegory has been illustrated by citing a series of historical events in the succeeding passages, and it has been shown that on the coming of every Messenger in every age, mankind divided itself into two groups. One group consisted of pure and capable people, who benefited from the guidance of the' Messengers, developed their capabilities to the fullest and brought forth the fruit of goodness. The second group, that consisted of impure people, displayed all their impurities in their encounter with the Messengers, and was sorted out, just as alloy is separated from gold, as a useless and worthless metal.