Surah Ar-Ra'd
لَهُۥ دَعْوَةُ ٱلْحَقِّ ۖ وَٱلَّذِينَ يَدْعُونَ مِن دُونِهِۦ لَا يَسْتَجِيبُونَ لَهُم بِشَىْءٍ إِلَّا كَبَـٰسِطِ كَفَّيْهِ إِلَى ٱلْمَآءِ لِيَبْلُغَ فَاهُ وَمَا هُوَ بِبَـٰلِغِهِۦ ۚ وَمَا دُعَآءُ ٱلْكَـٰفِرِينَ إِلَّا فِى ضَلَـٰلٍ
Lahū da‘watul-ḥaqq(i), wal-lażīna yad‘ūna min dūnihī lā yastajībūna lahum bisyai'in illā kabāsiṭi kaffaihi ilal-mā'i liyabluga fāhu wa mā huwa bibāligih(ī), wa mā du‘ā'ul-kāfirīna illā fī ḍalāl(in).
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].
📝 Footnotes
379) The true call is interpreted by the scholars as the acknowledgment of the meaning of the kalimat lā ilāha illallāh (there is no god but Allah), and it is also interpreted as worship and supplication.