Būluṣ ibn Rajāʾ (born 950s, died after 1009), nicknamed al-Wāḍiḥ ('the Exposer' or 'Clarifier'), was a Coptic Christian monk, priest and apologist under the Fāṭimid Caliphate.
[4] Ibn Rajāʾ studied the Qurʾān, tafsīr (Qurʾānic interpretation), ḥadīth (tradition) and Islamic law.
[2] During the reign of the Caliph al-Muʿizz (973–975), he witnessed the execution of a Muslim convert to Christianity in Old Cairo and was moved by his prophetic final words.
[2] When his family, who believed him to be lost in the desert, found him in Abū Sayfayn, they brought him home and tried to convince him to return to Islam.
[5] When these failed, he denounced his son to the Caliph al-ʿAzīz Bi'llāh, who appointed the chief judge of Egypt to investigate the case.
He received support from notable figures such as the caliph's Christian wife, al-Sayyida al-ʿAzīziyya, and was eventually let go.
[7] He gave an oral account his life to Theodore, who later passed it on to Michael of Damrū, who in 1051 incorporated Ibn Rajāʾ's biography into his continuation of the History of the Patriarchs of Alexandria under the patriachate of Philotheos (979–1003).
[14] The Nawādir and the Kitāb al-ibāna were reported by Paul Sbath [fr] in manuscripts now inaccessible to scholars.
[14] The Kitāb al-wāḍiḥ was translated into Latin in the 13th century under the title Liber denudationis sive ostensionis aut patefaciens ('Book of Denuding or Exposing, or the Discloser').