Musannaf Ibn Abi Shayba 13:2439

Abu Bakr narrated to us, he said: Waki’ narrated to us, he said: Yahya ibn al-Haytham al-Attar narrated to us, from al-Asbagh ibn Nubata, who said: We were in the time of Ali. Whoever reached a place in the market first, he was more entitled to it until the night.