Surah Al-Baqarah, ayah 170

2:170

وَإِذَا قِيلَ لَهُمُ ٱتَّبِعُواْ مَآ أَنزَلَ ٱللَّهُ قَالُواْ بَلۡ نَتَّبِعُ مَآ أَلۡفَيۡنَا عَلَيۡهِ ءَابَآءَنَآۚ أَوَلَوۡ كَانَ ءَابَآؤُهُمۡ لَا يَعۡقِلُونَ شَيۡـٔٗا وَلَا يَهۡتَدُونَ ١٧٠

Wa idhā qīla lahumut-tabi'ū mā anzalallāhu qālū bal nattabi'u mā alfaynā 'alayhi ābā'anā awalaw kāna ābā'uhum lā ya'qilūna shay'an walā yahtadūn

And when it is said to them, "Follow what Allāh has revealed," they say, "Rather, we will follow that which we found our fathers doing." Even though their fathers understood nothing, nor were they guided?