Abu Dawud Book 8, Hadith Number 2776.
Chapter : Not known.
Narated By Abdullah ibn Umar : When the Apostle of Allah (PBUH) arrived from his hajj, he entered Medina, and made (his camel) kneel down at the gate of his mosque; and he entered it and offered two rak’ahs of prayer; he then returned to his home. Nafi’ said: Ibn Umar also used to do so.