Sura 13 Ar-Ra'd (The Thunder), aya 14

1. لَهُ دَعْوَةُ الْحَقِّ ۖ وَالَّذِينَ يَدْعُونَ مِنْ دُونِهِ لَا يَسْتَجِيبُونَ لَهُمْ بِشَيْءٍ إِلَّا كَبَاسِطِ كَفَّيْهِ إِلَى الْمَاءِ لِيَبْلُغَ فَاهُ وَمَا هُوَ بِبَالِغِهِ ۚ وَمَا دُعَاءُ الْكَافِرِينَ إِلَّا فِي ضَلَالٍ

   To Him (alone) is the supplication of truth. And those they call upon besides Him do not respond to them with a thing, except as one who stretches his hands toward water (from afar, calling it) to reach his mouth, but it will not reach it (thus). And the supplication of the disbelievers is not but in error (i.e. futility).

   13:14

Tafsiri: Saheeh International