According to search-discovered classical Islamic scholarship, the Quranic principle of Muhkam and Mutashabih, outlined in Surah Al-Imran verse 7, establishes the foundational methodology for all Quranic interpretation. Ibn Kathir explains that 'Muhkamat' are the clear, unambiguous verses that form the 'Mother of the Book'—the core of its guidance. In contrast, 'Mutashabihat' are the allegorical or multi-faceted verses, particularly those concerning the unseen and divine attributes. Al-Tabari's linguistic analysis clarifies that the term Mutashabih implies resemblance and potential ambiguity, serving as a test. The verse warns that those with deviance (zaygh) in their hearts pursue these verses to incite discord (fitnah) and seek a self-serving interpretation (ta'wil). Conversely, the 'firmly grounded in knowledge' ('al-rasikhuna fi'l-'ilm') affirm their faith in the entire book, refer the allegorical to the clear, and submit to the fact that the ultimate reality is known to Allah. This principle is a cornerstone of Usul al-Tafsir, ensuring that interpretation remains anchored in the Quran's foundational clarity.