Musannaf Ibn Abi Shayba 36:397

Ubayd Allah ibn Musa narrated to us, from Ubayd Allah ibn Abi Ziyad, from Umm Yahya bint Ya'la, from her father, who said: I brought my father on the day of the conquest of Mecca and said: "O Messenger of Allah, this one pledges allegiance to you for the migration (Hijrah)." He said: "There is no migration after the conquest, but (there is) Jihad and intention."