Musnad Abu Ya'la al-Mawsili 123:1

'Abd al-A'la ibn Hammad al-Narsi narrated to us, Hammad ibn Salamah narrated to us, from Yahya ibn Sa'id, from Anas ibn Malik: That the Messenger of Allah (ﷺ) granted the Ansar land in Bahrain. They said: "O Messenger of Allah, and our brothers from the Muhajirun?" So he granted them [land] as well. Then he said: "You will encounter after me selfishness (preferential treatment of others over you), so be patient until you meet me."