Shams ad-Dīn Abū ʿAbd Allāh Muḥammad ibn Abī Bakr ibn Ayyūb az-Zurʿī d-Dimashqī l-Ḥanbalī , commonly known as Ibn Qayyim al-Jawziyya or Ibn al-Qayyim for short, or reverentially as Imam Ibn al-Qayyim in Sunni tradition, was an important medieval Islamic jurisconsult, theologian, and spiritual writer. Belonging to the Hanbali school of orthodox Sunni jurisprudence, of which he is regarded as "one of the most important thinkers," Ibn al-Qayyim was also the foremost disciple and student of Ibn Taymiyyah, with whom he was imprisoned in 1326 for dissenting against established tradition during Ibn Taymiyyah's famous incarceration in the Citadel of Damascus.

Ibn Qudāmah al-Maqdisī Muwaffaq ad-Dīn Abū Muḥammad ʿAbd Allāh ibn Aḥmad ibn Muḥammad , better known as Ibn Qudāmah, was a Sunni Muslim scholar, jurist, theologian, traditionist, and ascetic. Having authored many important treatises on Islamic jurisprudence and religious doctrine, including one of the standard works of Hanbali law, the revered al-Mughni, Ibn Qudamah is highly regarded in Sunni Islam for being one of the most notable and influential thinkers of the Hanbali school of orthodox Sunni jurisprudence. Within that school, he is one of the few thinkers to be given the honorific epithet of Shaykh of Islam, which is a prestigious title bestowed by Sunnis on some of the most important thinkers of their tradition. A proponent of the classical Sunni position of the "differences between the scholars being a mercy," Ibn Qudamah is famous for saying, "The consensus of the leaders of jurisprudence is an overwhelming proof, and their disagreement is a vast mercy."