Sayyidina Jabir ibn Abdullah (RA) reported that they were participating in a battle - Sufyan thought that it was the Battle of Banu Mustaliq. One of the Muhajirs kicked an Ansar, and called out, "O Muhajirs!" And the Ansar called for help. "O Ansars!" The Prophet (SAW) heard it and said, "What is wrong that you raise the cry of the.jahiliyah?" They said that a man of the Muhajirs had kicked one of Ansars. The Prophet (SAW) said, "Give up the practice (of the call), for, it is detestable." Abdullah ibn Ubayy ibn Salul heard that and asked. Have they done it? By Allah: They say, "If we return to Medina, surely the more honourable (element) will expel therefrom the meaner." (63; 8) Umar said, "O Messenger of Allah, permit me to chop off the head of this hypocrite." The Prophet (SAW) said, "Leave him alone else people will say that Muhammad kills his companions." A narrator other than Amr narrated that his son, Abdullah ibn Abdullah said, "By Allah! We shall not turn back till you admit that you are mean and Allah's Messenger (SAW) is honourable." So, he did admit that.
[Ahmed 14637, Bukhari 3518, Muslim 2584]