Quran 18:14 from Surah Al-Kahf on Divine Marvels.
وَرَبَطۡنَا عَلَىٰ قُلُوبِهِمۡ إِذۡ قَامُواْ فَقَالُواْ رَبُّنَا رَبُّ ٱلسَّمَٰوَٰتِ وَٱلۡأَرۡضِ لَن نَّدۡعُوَاْ مِن دُونِهِۦٓ إِلَٰهٗاۖ لَّقَدۡ قُلۡنَآ إِذٗا شَطَطًا
English translation: And We made firm [on] their hearts when they stood up and said Our Lord (is) the Lord (of) the heavens and the earth Never we will invoke besides Him besides Him any god Certainly we would have said then an enormity
Transliteration: warabatna ala qulubihim idh qamu faqalu rabbuna rabbu al-samawati wal-ardi lan nad'uwa min dunihi ilahan laqad qul'na idhan shatatan