According to search-discovered classical Islamic scholarship, the principle of 'miracles only by Allah's leave' (bi-Idhnillah) is a foundational tenet of Islamic creed (aqeedah). The Quran, in verses such as 40:78 and 13:38, unequivocally states that no messenger possesses the independent power to produce a miracle. Tafsir Ibn Kathir, in his commentary on 40:78, emphasizes that prophets are servants of Allah who can only manifest divine signs when granted permission as proof of their prophethood. This concept is critical as it safeguards the principle of God's absolute Oneness (Tawheed), affirming that Allah alone is the source of all power. Al-Qurtubi and other scholars confirm this understanding, distinguishing prophetic miracles from magic or personal charisma by their divine origin. This theological framework ensures that prophets are revered as messengers, not worshipped as divine, reinforcing that all power and authority ultimately belong to Allah alone.