Musnad Ahmad 31:292

Waki’ narrated to us, from Isma’il bin Rafi’, from Muhammad bin Yahya, from his paternal uncle Wasi’ bin Habban, from Abu Sa’id al-Khudri, from the Prophet (peace and blessings of Allah be upon him), who said: "A man is more entitled to the front of his riding beast, and more entitled to his seat if he returns to it."