سنن ابو داؤد #396

Abd Allah b. 'Amr reported the Prophet (ﷺ) as saying:The time of the Zuhr prayer is as along as the time of the 'Asr prayer has not come; the time of the Asr prayer is as long as the sun has not become yellow ; the time of the Maghrib prayer is as long as the twilight has not ended; the time of the Isha prayer is up to midnight; and the time of the Fajr prayer is as long as the sun has not risen