Jabir bin Abdullah (RA) reported: We were along with Allahs Messenger ﷺ in an expedition that a person from amongst the emigrants struck at the back of a person from the Ansir. The Ansiri said: O Ansar! And the Muhijir said: O Emigrants! Thereupon Allahs Messenger ﷺ said: What are these proclamations of the Days of Ignorance? They said: Allahs Messenger, a person from the emigrants struck at the back of an Ansari, whereupon he said: It is something disgusting. Abdullah bin Ubayy heard it and said: They have indeed done it. By Allah, when we would return to Madinah the respectable amongst them (the Ansar) would turn away the mean (the emigrants). Thereupon Umar said: Permit me so that I should strike the neck of this hypocrite. But he (the Holy Prophet) said: Leave him, the people may not say that Muhammad kills his companions.