Musnad Abu Ya'la al-Mawsili 3:151

Ubayd Allah ibn Umar narrated to us, Abd al-Rahman narrated to us, Sufyan and Shu'bah narrated to us, from Mansur ibn al-Mu'tamir, from Hilal ibn Yasaf, from Wahb ibn al-Ajda', from Ali, from the Prophet, peace be upon him, who said: "Do not pray after the Asr [prayer], unless you pray while the sun is high."