Ibn Muljam

ʿAbd al-Rahman ibn Muljam al-Murādiyy (Arabic: عبدالرحمن بن ملجم المرادي‎) was a Khariji known for assassinating Ali, the fourth Caliph of Islam.

Was it written for Ibn Muljam to kill Imam Ali and Imam Hussain to be killed by the order of Yazid in Karbala since both events were foretold by Prophet Muhammad (s)? Should we believe that a person may die prematurely? Sayyed Mohammad Al-Musawi	Why did Khidhr (as) kill a child for his future crimes whereas Imam Ali (as) did not kill Ibn Muljim despite knowing that he would be his potential assassin on the basis that he had not yet committed that grievous crime? Zoheir Ali Esmail
What are the sources in history for the narratives we hear about Imam Ali's (a) generosity and kindness towards Ibn Muljam after he had struck the Imam that led to his martyrdom? Zaid Alsalami