Sunan at-Tirmidhi (Jami-al-Tirmidhi), Chapter: Salah (Prayers)

reported from his father (Buraidah (RA). He said someone came to the Prophet (SAW) and asked him about the times of salah. He said, "Stay with us, Insha-Allah."Then he commanded Sayyidina Bilal (RA) and he called the Iqamah at the time of rise of dawn. Then he commanded Sayyidina Bilal (RA) and he gave the Iqamah at the declination of the sun and (they) offered the Zuhr Salah. Then he commanded him (Bilal) and he called the iqamah and (they) offered the asr while the sun was high and bright. Then when the sun set, he gave the command for Maghrib. Then he gave the command for Isha and he called the iqamah when the twilight had disappeared. Then, the next day, he gave the command and the fair was offered in a good light. Then he commanded for the Zuhr and they offered it when the extreme heat had cooled down. Then he gave the command for the Asr and he gave the iqamah when the sun's time was more delayed than the previous day. Then he gave the command for Maghrib and (they) offered it a little before twilight disappeared. Then he gave the command for Isha and he called its iqamah when a third of the night had passed. Then the Prophet (SAW) asked, "Where is he who had asked about the times of Salah?" He said, "Here am I!" So, he said, "The times of Salah are between these two times." [Ahmed 23016, Nisai 515, Ibn e Majah 667, Muslim 613]