This is also part of His complete power and supreme authority Allah says:وَهُوَ الَّذِي أَرْسَلَ الرِّيَاحَ بُشْرًا بَيْنَ يَدَيْ رَحْمَتِهِAnd it is He Who sends the winds as heralds of glad tidings, going before His mercy;Allah sends the winds as heralds of glad tidings, i.e., they bring the clouds behind them.The winds are of many different types, depending on the purpose for which they are sent. Some of them form the clouds, others carry the clouds or drive them, and others come ahead of the clouds as heralds announcing their coming. Some of them come before that to stir up the earth, and some of them fertilize or "seed" the clouds to make it rain.Allah says:وَأَنزَلْنَا مِنَ السَّمَاء مَاء طَهُورًاand We send down pure water from the sky,meaning, as a means of purifying it.Abu Sa`id said,"It was said:"O Messenger of Allah, can we perform Wudu' with the water of the well of Buda`ah, for it is a well in which rubbish and the flesh of dogs are thrown.He said:إِنَّ الْمَاءَ طَهُورٌ لَا يُنَجِّسُهُ شَيْءWater is pure and nothing makes it impure.This was recorded by Ash-Shafi`i and Ahmad, who graded it Sahih, and also by Abu Dawud and At-Tirmidhi, who graded it Hasan, and by An-Nasa'i.His saying