Leave it, for it is disgraceful

The Prophet (ﷺ) was traveling on an expedition with his Companions from the Muhājirīn and the Ansār (may Allah be pleased with them). A man from the Muhājirīn struck the back of a man from the Ansār with his hand. The Ansāri cried: Help me, O Ansār! and the Muhājiri cried: Help me, O Muhājirīn! The Messenger of Allah (ﷺ) heard this and said: What is this? They said: A man from the Muhājirīn struck the back of a man from the Ansār with his hand. The Ansāri said: Help me, O Ansār!

and the Muhājiri said: Help me, O Muhājirīn! The Prophet (ﷺ) said: Abandon this pre-Islamic practice, for it is vile, detestable, and harmful. It is when a man, if overpowered by his opponent, calls upon his tribe, and they rush to his aid—whether he is the oppressor or the oppressed—out of ignorance and tribalism. Jābir said: The Ansār were more numerous when the Prophet (ﷺ) first arrived in Madīnah as an emigrant, but later the Muhājirīn increased in number.

The chief of hypocrisy, ‘Abdullah ibn ’Ubay ibn Salūl, said: Has the matter really reached this extent?! By Allah, when we return to Madīnah, the mightier ones—meaning himself and his followers—will surely expel the weaker ones—meaning the Prophet (ﷺ) and his followers—from Madīnah. ‘Umar ibn al-Khattāb (may Allah be pleased with him) said: Let me, O Messenger of Allah, strike the neck of this hypocrite.

The Prophet (ﷺ) said: Leave him, so that people will not say that Muhammad kills his followers—even those who only outwardly appear to be among them.