Musannaf Ibn Abi Shayba 3:4967

Ghundar narrated to us, from Shu'bah, from Ya'la ibn 'Ata, from Yazid ibn Talq, from 'Abd al-Rahman ibn al-Baylamani, from 'Amr ibn 'Abasah, who said: I said, "O Messenger of Allah, is there any hour closer to Allah than another?" He said, "Yes, the middle of the night. So pray what seems good to you until you pray the morning prayer. Then refrain until the sun rises and is like a shield, until it spreads. Then pray what seems good to you until the pillar stands over its shadow. Then refrain until the sun passes the meridian, for the Hellfire is heated at midday. Then pray what seems good to you until you pray the afternoon prayer. Then refrain until the sun sets, for it rises between the two horns of a devil and sets between the two horns of a devil."