(1) CHAPTER. What is said regarding the acceptance of the information given by one truthful person concerning Adhan, Salat (prayer), Saum (fasting), and all other obligations and laws prescribed by Allah.
Narrated Hudhaifa: The Prophet said to the people of Najran, I will send to you an honest person who is really trustworthy. The Companion, of the Prophet each desired to be that person, but the Prophet sent Abu 'Ubaida.
Authentic