Times of the Prayers

Bukhari :: Book 1 :: Volume 10 :: Hadith 557

Narrated Hisham's father:

Ibn 'Umar said, "Allah's Apostle said, 'Do not pray at the time of sunrise and at the time of sunset.' " Ibn 'Umar said, "Allah's Apostle said, 'If the edge of the sun appears (above the horizon) delay the prayer till it becomes high, and if the edge of the sun disappears, delay the prayer till it sets (disappears completely).' "

Source materials are from the University of Southern California MSA site
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