Musnad Ahmad

It is narrated from Hazrat Amr bin Abasah (may Allah be pleased with him) that once I presented myself in the court of the Messenger and said: O Messenger of Allah! Who has accepted Islam with you? The Prophet (peace and blessings be upon him) said: "Both the free and the slave" (Hazrat Abu Bakr and Hazrat Bilal, may Allah be pleased with them). I said: O Messenger of Allah! Teach me some of the knowledge that Allah has given you. Is there any time that is more virtuous? The Prophet (peace and blessings be upon him) said: "The last part of the night is the most virtuous, at that time the angels are present and the prayer is accepted. When you have performed the Fajr prayer, refrain from offering voluntary prayers until the sun rises. Even when the sun rises, do not pray until the sun has risen high, because when it rises, it rises between the two horns of Satan, and at that time the disbelievers prostrate to it. However, when it has risen to the height of one or two spears, then you may pray, for this is the time when the angels are present, until the shadow of a spear appears, then refrain from prayer, for at that time Hell is kindled. However, when the shadow declines, you may pray, for in this prayer too the angels are present, until you have performed the Asr prayer. After the Asr prayer, refrain from offering voluntary prayers until sunset, for it sets between the two horns of Satan and at that time the disbelievers prostrate to it." And Hazrat Amr bin Abasah (may Allah be pleased with him) used to say that I am a quarter of Islam, and Abdur Rahman bin Beilmani used to offer two rak'ahs after Asr.