Musannaf Ibn Abi Shayba 17:171

Waki’ narrated to us, from Ibn Abi Layla, Muhammad bin Abd al-Rahman, from Muhammad bin Sharhabil, from Qays bin Sa’d, who said: The Messenger of Allah said: "A man is more entitled to the front of his riding beast, and if he returns to his sitting place, then he is more entitled to it."