Sahih Bukhari Volume 3, Book 40, Hadith Number 564.

Narated By Anas : The Prophet decided to grant a portion of (the uncultivated land of) Bahrain to the Ansar. The Ansar said, “(We will not accept it) till you give a similar portion to our emigrant brothers (from Quraish).” He said, “(O Ansar!) You will soon see people giving preference to others, so remain patient till you meet me (on the Day of Resurrection).