What is the detailed explanation of the Hadith: "Whoever speaks about the Quran according to his own opinion has erred," and is a person's feeling of attachment to a specific verse wrong if it has another interpretation? How did the main sources of Tafsir come about, what is the method for verifying traditional Tafsir, what is an isnad, how are innovations (bid'ah) identified, and what are the signs of an authentic narration (athar)?

The interpretation of the Quran has principles that must be mastered, and individual understandings of verses must be presented to the sayings of scholars and exegetes. If they align, they are accepted; otherwise, they are corrected. Interpretation relies on the Quran, the Sunnah, the sayings of the Salaf, and the Arabic language. One can also draw upon the occasions of revelation (Asbab al-Nuzul) and narratives from the People of the Book. Furthermore, distinguishing between authentic and weak narrations falls under the science of Hadith terminology. Speaking about the Book of Allah based on opinion without knowledge is an error, even if it happens to be correct.