Jihad (Kitab Al-Jihad)
Dawud :: Book 14 : Hadith 2776
Narrated Abdullah ibn Umar:
When the Apostle of Allah (peace_be_upon_him) 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.