sent forth the winds as heralds of His mercy,” meaning: the rain.
Muhammad said: “nushuran” (heralds/spreaders) with the damma is the plural of “nashur,” like “rasul” (messenger) and “rusul” (messengers). “And We have sent down from the sky water,” meaning: the rain, “pure,” for the believers, to purify themselves with it from ritual impurities (ahdath) and major ritual impurity (janaba).