According to search-discovered classical Islamic scholarship, the Quranic concept of 'blindly following forefathers' (Taqlid al-Aba') is the condemned practice of prioritizing inherited customs over divine revelation. This theme is central to verses like Quran 2:170 and 5:104, where, as Ibn Kathir explains, disbelievers reject prophetic guidance by stating, 'Rather, we will follow that which we found our fathers doing,' even if their ancestors were ignorant and unguided. Al-Tabari's analysis reinforces that this argument is rebuked because the ultimate authority must be reason and revelation, not unverified tradition. Furthermore, verse 6:138 provides a concrete example of such traditions: the pagans invented prohibitions on certain cattle and crops, falsely attributing them to Allah. This entire framework of creating and following baseless traditions is rendered invalid by the declaration in Quran 5:3: 'This day I have perfected your religion for you,' signifying that Islam is complete and requires no such human additions. The synthesis of these verses establishes a core Islamic principle: the only reliable sources for religious injunctions are the Quran and authentic Sunnah, not customs devoid of divine authority.