Quran Al-Baqarah 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
Translation
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?