Musnad Ahmad 32:651

Yunus narrated to us, Harb ibn Maymun narrated to us, from al-Nadr ibn Anas, from Anas, from the Prophet, peace and blessings of Allah be upon him, who said: "O Allah, forgive the Ansar, and the children of the Ansar, and the spouses of the Ansar, and the descendants of the Ansar. The Ansar are my inner circle and my trusted confidants. If the people were to take a valley, and the Ansar were to take a valley, I would take the valley of the Ansar. And were it not for the migration, I would have been a man from among the Ansar."