Musnad Abu Ya'la al-Mawsili 108:57

Abu Khaythama narrated to us, Sufyan ibn 'Uyayna narrated to us, he heard 'Amr [narrating] from Jabir ibn 'Abd Allah, who said: We were with the Messenger of Allah (may Allah bless him and grant him peace) on a military expedition, and a man from the Emigrants (Muhajirun) kicked a man from the Helpers (Ansar). The Ansari said: "O for the Ansar!" The Muhajiri said: "O for the Muhajirun!" The Messenger of Allah (may Allah bless him and grant him peace) heard that and said: "What is this call of the pre-Islamic era (Jahiliyyah)?" It was said: "O Messenger of Allah, a man from the Emigrants kicked a man from the Helpers." The Messenger of Allah (may Allah bless him and grant him peace) said: "Leave it, for it is foul."