Sayyiduna Mujashi' bin Mas'ud al-Sulami (may Allah be pleased with him) said: I brought my brother Ma'bad to the Messenger of Allah (peace and blessings be upon him) so that he would take his pledge for emigration. He (peace and blessings be upon him) said: "The people of emigration have already taken its reward." I said: Then on what will you take his pledge? He (peace and blessings be upon him) said: "I take his pledge for Islam - or faith - and jihad." Later I met Ma'bad and asked him to confirm this incident - he was the elder of the two brothers - and he said: He has spoken the truth.
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17897