Musnad Ahmad 189:4

'Affan narrated to us, Yazid bin Zuray' narrated to us, he said: Khalid al-Hadhdha' narrated to us, from Abu 'Uthman, from Mujashi' bin Mas'ud, he said: I said: "O Messenger of Allah, this is Mujalid bin Mas'ud pledging allegiance to you for the Hijrah (migration)." He said: "There is no Hijrah after the conquest of Makkah, but I will accept his pledge of allegiance for Islam."