(28) Chapter. Whoever got (or was able to offer) one Raka of the Fajr prayer (in time) [One Raka means, one standing, one bowing, and two prostrations].
Narrated Abu Huraira: Allah's Apostle said, "Whoever could get one rak`a (of the Fajr prayer) before sunrise, he has got the (morning) prayer and whoever could get one rak`a of the `Asr prayer before sunset, he has got the (`Asr) prayer."
Hadith ReferenceSahih Bukhari / The Book of The Times of As-Salat (The Prayers) and Its Superiority / Hadith: 579
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة