Maqalat al-Islamiyyin (The Treatises/Teachings of the Muslims and the Differences of the Prayerful) is one of the most vital heresiographical works in Islamic history. Written by Abu al-Hasan al-Ash'ari (d. 324/935), the founder of the Ash'ari school of theology, it serves as a massive encyclopedia of the diverse theological positions held by early Muslim sects.
This is a guide to locating and understanding the English translation of Maqālāt al-Islāmiyyīn wa Ikhtilāf al-Muṣallīn (مقالات الإسلاميين واختلاف المصلين) by Abū al-Ḥasan al-Ashʿarī (d. 935 CE). maqalat al-islamiyyin english pdf
provide comparative looks at similar early theological texts. SifatuSafwa Why Study It Today? "Al-Ashʿarī's Maqālāt and the Early Islamic Sects" by W
The work is celebrated for its objective and somewhat impartial survey of the diverse doctrines held by various Islamic sects during the early centuries of Islam. Overview and Purpose provide comparative looks at similar early theological texts
Digital Libraries: Websites like the Internet Archive (archive.org) often host a variety of texts, including religious and academic works. You might find a scanned version or a PDF of "Maqalat al-Islamiyyin" here.