al-Ibāna

Also known as al-Ibāna ʻan uṣūl ad-diyāna, Al-Ibana an Usul al-Diyana

Al-Ibana an Usul al-Diyana (), or simply Al-Ibana, is a 10th-century theological work attributed to Abu al-Hasan al-Ash'ari, the founder of the Ash'ari school. Scholars debate both its authorship and timing, as the book follows a traditional approach rather than the Ash'ari kalam method. Some suggest it was written soon after al-Ash'ari left the Mu'tazilism, representing a new declaration, while others argue it was composed later in his life, possibly showing a shift from his established kalam method.