Musnad Ahmad 32:680

Ibrahim narrated to us, Al-Harith ibn Umayr narrated to us, from Humayd al-Tawil, from Anas: "That the Prophet, peace and blessings of Allah be upon him, when he would return from a journey and look at the walls of Medina, he would make his she-camel go faster. And if he were on a mount, he would urge it on, out of his love for it."