he sends down water from the cloud then watercourses flow according to their measure and the torrent bears along the swelling foam and from what they melt in the fire for the sake of making ornaments or apparatus arises a scum like it thus does allah compare truth and falsehood then as for the scum it passes away as a worthless thing and as for that which profits the people it tarries in the earth thus does allah set forth parables.
أنزل من السماء ماء فسالت أودية بقدرها فاحتمل السيل زبدا رابيا ومما يوقدون عليه في النار ابتغاء حلية أو متاع زبد مثله كذلك يضرب الله الحق والباطل فأما الزبد فيذهب جفاء وأما ما ينفع الناس فيمكث في الأرض كذلك يضرب الله الأمثال