Musnad Abu Ya'la al-Mawsili 11:2

Al-Salt ibn Mas'ud al-Jahdari narrated to us, Yahya ibn 'Abd Allah ibn Yazid ibn 'Abd Allah ibn Unays narrated to me, my paternal uncle al-Hasan ibn Yazid narrated to me, from 'Abd Allah ibn Unays: That the Messenger of Allah (may Allah bless him and grant him peace) sent him on a military expedition alone.