Quran 2:16 from Surah Al-Baqara on Divine Marvels.
أُوْلَٰٓئِكَ ٱلَّذِينَ ٱشۡتَرَوُاْ ٱلضَّلَٰلَةَ بِٱلۡهُدَىٰ فَمَا رَبِحَت تِّجَٰرَتُهُمۡ وَمَا كَانُواْ مُهۡتَدِينَ
English translation: Those (are) the ones who bought [the] astraying for [the] guidance So not profited their commerce and not were they guided-ones
Transliteration: ulaika alladhina ish'tarawu al-dalalata bil-huda fama rabihat tijaratuhum wama kanu muh'tadina