Mujahid (may Allah have mercy on him) says: See whether my narration agrees with what you have heard from the letter: Sayyiduna Umar (may Allah be pleased with him) wrote to Sayyiduna Abu Musa al-Ash'ari (may Allah be pleased with him): Pray Zuhr when the sun is high, meaning when it has declined; pray Asr while the sun is white and clear; pray Maghrib when the sun has set; and he said: Pray Isha up to half of the night; and pray Subh in the darkness, or in the blackness (before dawn), and lengthen the recitation.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 1762
Hadith Gradingمحدثین:صحيح لغيرهٖ
Hadith Takhrij«صحيح لغيرهٖ۔ أخرجه عبد الرزاق 2035»