The Inevitable 56:68. Juz 27, page 536.
أَفَرَءَيْتُمُ ٱلْمَآءَ ٱلَّذِى تَشْرَبُونَ٦٨
Have ye observed the water which ye drink?
Al-Waqi'ah 56:68, translated by Marmaduke Pickthall