Muḥammad ibn Isḥāq ibn Yasār ibn Khiyār; according to some sources, ibn Khabbār, or Kūmān, or Kūtān, Arabic: محمد بن إسحاق بن يسار بن خيار‎, or simply ibn Isḥaq, ابن إسحاق, meaning "the son of Isaac" (died 767) was an Arab Muslim historian and hagiographer. Ibn Ishaq collected oral traditions that formed the basis of an important biography of the Islamic prophet Muhammad.

Ayatollah Muhammad Taqi Misbah Yazdi was born in Yazd, Iran in 1934. He took courses taught by Imam Khomeini in Qom while he also studied Qur'anic exegesis and the philosophies of Ibn Sina and Mulla Sadra with Allamah Muhammad Husayn Tabataba'i. He also attended Ayatullah Bahjat's fiqh seminars for many years. Since 1975 he established, directed, and taught in different academic institutes and e is now the director of the Imam Khomeini Education and Research Institute in Qum.