Musnad Abu Ya'la al-Mawsili 159:70

And with his chain of narration, that the Messenger of Allah (may Allah bless him and grant him peace) said: "Were it not for the emigration, I would have been a man from the Ansar. And if the people traveled through a valley or a mountain pass, and the Ansar traveled through a valley or a mountain pass, I would have traveled through the valley of the Ansar or the mountain pass of the Ansar."