According to search-discovered classical Islamic scholarship, the Quranic concept of **Ittiba al-Zann (إتّباع الظن)**, or 'following conjecture,' is a significant prohibition against basing one's core beliefs and actions on baseless assumptions, speculation, and the unverified opinions of others. In his tafsir of Quran 6:116, Imam Al-Tabari explains that those who follow conjecture are essentially following falsehood and lies. Ibn Kathir elaborates on this, stating that the majority of people often rely on 'wishful thinking and delusions' rather than divine guidance. This concept is contrasted with the Islamic imperative to seek **'ilm (knowledge)** and **yaqeen (certainty)**, which are grounded in divine revelation. Al-Qurtubi, in his commentary, clarifies that the warning in verse 6:116 against following the majority is specifically about matters of faith and law where they deviate from the clear path of Allah. The synthesis across these verses and scholarly interpretations establishes 'Ittiba al-Zann' as a root of misguidance, emphasizing that truth in Islam is derived from divine sources, not popular consensus or speculation.