Musnad Abu Ya'la al-Mawsili 2:23

Mus'ab narrated to us, 'Abd al-'Aziz bin Muhammad narrated to us, from 'Ubayd Allah bin 'Umar, from Nafi', from Ibn 'Umar, who said: 'Umar allotted for Usamah more than what he allotted for me. So I said, "My migration and Usamah's migration were one." He said, "Indeed, his father was more beloved to the Messenger of Allah, may Allah bless him and grant him peace, than your father, and he was more beloved to the Messenger of Allah, may Allah bless him and grant him peace, than you. And your parents only migrated with you."