It is narrated from Malik bin Abi Amir Asbahi that Sayyiduna Umar bin Al-Khattab, may Allah be pleased with him, wrote to Sayyiduna Abu Musa Ash'ari, may Allah be pleased with him, that: Perform the Zuhr prayer when the sun declines, and perform the Asr prayer while the sun is still white and clear, not allowing it to become yellow. And perform the Maghrib prayer when the sun sets. And delay the Isha prayer as long as you can stay awake. And perform the morning prayer while the stars are still clearly visible and dense, and recite two long surahs from the Mufassal in the Fajr prayer.