Accepting Information Given by a Truthful Person

Bukhari :: Book 9 :: Volume 91 :: Hadith 357

Narrated 'Abdullah bin 'Umar:

While the people were at Quba offering the morning prayer, suddenly a person came to them saying, "Tonight Divine Inspiration has been revealed to Allah's Apostle and he has been ordered to face the Ka'ba (in prayers): therefore you people should face it." There faces were towards Sham, so they turned their faces towards the Ka'ba (at Mecca).