Sayyiduna al-Bara' (may Allah be pleased with him) said: The first of the Muhajirun to come to us was Mus'ab bin Umayr (may Allah be pleased with him) - one of Banu Abd al-Dar bin Qusayy. I asked him: "How is the Messenger of Allah (peace and blessings be upon him)?" He said: "He is in his place, and his Companions are coming after me."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17973