Sura al-Raʿd 13:17

أَنزَلَ مِنَ ٱلسَّمَآءِ مَآءً فَسَالَتْ أَوْدِيَةٌۢ بِقَدَرِهَا فَٱحْتَمَلَ ٱلسَّيْلُ زَبَدًا رَّابِيًا وَمِمَّا يُوقِدُونَ عَلَيْهِ فِى ٱلنَّارِ ٱبْتِغَآءَ حِلْيَةٍ أَوْ مَتَٰعٍ زَبَدٌ مِّثْلُهُۥ كَذَٰلِكَ يَضْرِبُ ٱللَّـهُ ٱلْحَقَّ وَٱلْبَٰطِلَ فَأَمَّا ٱلزَّبَدُ فَيَذْهَبُ جُفَآءً وَأَمَّا مَا يَنفَعُ ٱلنَّاسَ فَيَمْكُثُ فِى ٱلْأَرْضِ كَذَٰلِكَ يَضْرِبُ ٱللَّـهُ ٱلْأَمْثَالَ

anzala mina l-samāʾi māʾan fa-sālat awdiyatun biqadarihā fa-iḥtamala l-saylu zabadan rrābīan wa-mimmā yūqidūna ʿalayhi fī l-nāri ibtighāʾa ḥilyatin aw matāʿin zabadun mithluhu ka-dhālika yaḍribu allāhu l-ḥaqqa wa-l-bāṭila fa-ammā l-zabadu fa-yadhhabu jufāʾan wa-ammā mā yanfaʿu l-nāsa fa-yamkuthu fī l-arḍi ka-dhālika yaḍribu allāhu l-amthāla

He sends down water from the skies, and the channels flow, each according to its measure: But the torrent bears away to foam that mounts up to the surface. Even so, from that (ore) which they heat in the fire, to make ornaments or utensils therewith, there is a scum likewise. Thus doth Allah (by parables) show forth Truth and Vanity. For the scum disappears like forth cast out; while that which is for the good of mankind remains on the earth. Thus doth Allah set forth parables.