18:41
Al-Kahf 41
Surah Al-Kahf (الكهف), verse 41 — reference 18:41. Arabic text with optional translation and free audio on Al-Qalam.
أَوْ يُصْبِحَ مَآؤُهَا غَوْرًا فَلَن تَسْتَطِيعَ لَهُۥ طَلَبًا
aw yuṣ'biḥa māuhā ghawran falan tastaṭīʿa lahu ṭalaban
Or its water will become sunken [into the earth], so you would never be able to seek it."