Leave it. for it is something disgusting. Ibn Mansur said that in the narration transmitted on the authority of Amr (these words are also found):" I heard Jabir."
Sahih Muslim Book 45, Hadith 82
← Previous Hadith We were along with Allah's 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 Allah's Messenger (ﷺ) said: What are these proclamations of the Days of Ignorance? They said: Allah's Messenger, a person from the emigrants struck at the back of an Ansari, whereupon he said: It is something disgusting. 'Abdullah b. Ubayy heard it and said: They have indeed done it. By Allah, when we would return to Medina 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.

Sahih Muslim Book 45, Hadith 81 Next Hadith → A believer is like a brick for another believer, the one supporting the other.

Sahih Muslim Book 45, Hadith 83