Abu Dawud Book 4, Hadith Number 1946.

Narated By A man from the Companions of the Prophet : AbdurRahman ibn Mu’adh said that he heard a man from the Companions of the Prophet (PBUH) say: The Prophet (PBUH) addressed the people at Mina and he made them stay in their dwellings. He then said: The Muhajirun (Emigrants) should stay here, and he made a sign to the right side of the qiblah, and the Ansar (the Helpers) here, and he made a sign to the left side of the qiblah; the people should stay around them.