It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that when the Messenger of Allah (peace and blessings be upon him) arrived from Makkah, the young boys of Banu Abd al-Muttalib came out to welcome him, and he (peace and blessings be upon him) seated one in front of him and another behind him (on his mount).
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11903