Bukhari :: Book 2 :: Volume 26 :: Hadith 719
Narrated 'Abdullah bin Masud:
I offered (only a) two Rakat prayer with the Prophet (at Mina), and similarly with Abu Bakr and with 'Umar, and then you d offered in opinions. Wish that I would be lucky enough to have two of the four Rakat accepted (by Allah).
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