Quran 6:43 from Surah Al-An'aam on Divine Marvels.
فَلَوۡلَآ إِذۡ جَآءَهُم بَأۡسُنَا تَضَرَّعُواْ وَلَٰكِن قَسَتۡ قُلُوبُهُمۡ وَزَيَّنَ لَهُمُ ٱلشَّيۡطَٰنُ مَا كَانُواْ يَعۡمَلُونَ
English translation: Then why not when came to them Our punishment they humbled themselves But became hardened their hearts and made fair-seeming to them the Shaitaan what they used to do
Transliteration: falawla idh jaahum basuna tadarra'u walakin qasat qulubuhum wazayyana lahumu al-shaytanu ma kanu ya'maluna