Sahih Bukhari
Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
Volume: 005 / Book Number: 059 / Hadith Number: 563
Narrated 'Amir:
Whenever Ibn 'Umar greeted the son of Ja'far, he used to say (to him), "Assalam 'Alaika (i.e. peace be on you) O the son of two-winged person."