Musnad Abu Ya'la al-Mawsili 3:321

Abu Khaythama narrated to us, Jarir ibn Abd al-Hamid narrated to us, from Mansur, from Hilal ibn Yasaf, from Wahb ibn al-Ajda’, from Ali, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "Do not pray after the Asr [prayer] unless the sun is white and high."