Quran 6:116 from Surah Al-An'aam on Divine Marvels.
وَإِن تُطِعۡ أَكۡثَرَ مَن فِي ٱلۡأَرۡضِ يُضِلُّوكَ عَن سَبِيلِ ٱللَّهِۚ إِن يَتَّبِعُونَ إِلَّا ٱلظَّنَّ وَإِنۡ هُمۡ إِلَّا يَخۡرُصُونَ
English translation: And if you obey most of (those) in the earth they will mislead you from (the) way (of) Allah Not they follow except [the] assumption and not they (do) except guess
Transliteration: wa-in tuti' akthara man fi al-ardi yudilluka an sabili al-lahi in yattabi'una illa al-zana wa-in hum illa yakhrusuna