Musnad Ahmad 32:1132

Yazid narrated to us, Humaid informed us, from Anas, who said: The Emigrants (Muhajirun) said: "O Messenger of Allah, we have never seen the likes of a people we have come to who are better in sharing when they have little, nor better in giving when they have much. They have spared us the burden, and they have made us partners in the pleasant things, until we thought that they would take all the reward." He said: "No, as long as you praise them and pray to Allah for them."