Iyas bin Salamah (may Allah have mercy on him) narrates that Sayyiduna Salamah bin al-Akwa' (may Allah be pleased with him) came to Madinah, and Sayyiduna Buraydah bin al-Husayb (may Allah be pleased with him) met him and said: O Salamah, have you turned back from your emigration? He said: I seek refuge with Allah; this is with the permission of the Messenger of Allah (peace and blessings be upon him). I heard the Messenger of Allah (peace and blessings be upon him) saying: "O Aslam, go out into the open country, take in the open air, and settle in the valleys." They said: We fear that this will alter our emigration. The Messenger of Allah (peace and blessings be upon him) said: "You will remain Muhajirun wherever you are."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6238