Al-Istibsar is the fourth important book of Shi'a Islamic Hadith. It was written by Abu Ja'far al-Tusi.

Mahmoud Ahmadinejad (Persian: محمود احمدی‌نژاد‎, Mahmūd Ahmadinezhād [mæhˈmuːd(-e) æhmædiːneˈʒɒːd] ( listen),English: /ɑːkməˈdɪnɨʒɒd/; born 28 October 1956) is the sixth and current President of the Islamic Republic of Iran, and the main political leader of the Alliance of Builders of Islamic Iran, a coalition of conservative political groups in the country. An engineer and teacher from a poor background, Ahmadinejad joined the Office for Strengthening Unity after the Islamic Revolution. Appointed a provincial governor, he was removed after the election of President Mohammad Khatami and returned to teaching. Tehran's council elected him mayor in 2003. He took a religious hard line, reversing reforms of previous moderate mayors. His 2005 presidential campaign, supported by the Alliance of Builders of Islamic Iran, garnered 62% of the runoff election votes, and he became President on 3 August 2005. His second presidency term ends on August 3, 2013. He is not eligible to run for another term under the current Iranian constitution.