According to search-discovered classical Islamic scholarship, the nature of God (Allah) is defined by the core principle of Tawheed (absolute monotheism), understood through two complementary approaches found in the Quran. The first is **Ithbat** (affirmation), powerfully demonstrated in Ayat al-Kursi (Quran 2:255), which affirms Allah's perfect attributes of life, sustenance, knowledge, and power. Tafsir by Ibn Kathir emphasizes this verse as the most comprehensive declaration of God's supreme and distinct reality. The second approach is **Tanzih** (negation of imperfection), exemplified in Surah An-Najm (53:19-28). Al-Tabari's commentary on these verses explains that by refuting the pre-Islamic goddesses as mere names and conjectures, the Quran defines Allah's nature by what He is not: He is not created, not dependent, and not subject to human whims. Finally, Surah Al-Hujurat (49:14-15) clarifies that a true understanding of Allah's nature transcends mere verbal submission ('Islam') and becomes true faith ('Iman') only when this perfect, unique, and transcendent reality is internalized in the heart without doubt. This synthesis establishes that the Islamic conception of God's nature is built upon the unwavering affirmation of His perfection and the decisive negation of any form of partnership or similitude.