Sahih Muslim #1288

You observe with us the prayer. He commanded Bilal, and he uttered the call to prayer in the darkness of night preceding daybreak and he said the morning prayer till dawn had appeared. He then commanded him (Bilal) to call for the noon prayer when the sun had declined from the zenith. He then commanded him (Bilal) to call for the afternoon prayer when the sun was high. He then commanded him for the evening prayer when the sun had set. He then commanded him for the night prayer when the twilight had disappeared. Then on the next day he commanded him (to call for prayer) when there was light in the morning. He then commanded him (to call) for the noon prayer when the extreme heat was no more. He then commanded him for the afternoon prayer when the sun was bright and clear and yellowness did not blend with it. He then commanded him to observe the sunset prayer. He then commanded him for the night prayer when a third part of the night bad passed or a bit less than that. Harami (the narrator of this hadith) was in doubt about that part of the mentioned hadith which concerned the portion of the night. When it was dawn, he (the Holy Prophet) said: Where is the inquirer (who inquired about the times of prayer and added): Between (these two extremes) is the time for prayer.