Quran 18, Al-Kahf (The Cave) ⓘ

18:14And We made firm their hearts when they stood forth and said: Our Lord is the Lord of the heavens and the earth. We cry unto no Allah beside Him, for then should we utter an enormity.

وَرَبَطْنَا عَلَى قُلُوبِهِمْ إِذْ قَامُوا فَقَالُوا رَبُّنَا رَبُّ السَّمَاوَاتِ وَالْأَرْضِ لَنْ نَدْعُوَ مِنْ دُونِهِ إِلَهًا لَقَدْ قُلْنَا إِذًا شَطَطًا