Sahih Bukhari Volume 002, Book 020, Hadith Number 217.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 20. Shortening The Prayers (At-Taqseer)
Narated By 'Abdullah bin Buraida : 'Imran bin Husain had piles. Once Abu Ma mar narrated from 'Imran bin Husain had said, "I asked the Prophet (p.b.u.h) about the prayer of a person while sitting. He said, 'It is better for one to pray standing; and whoever prays sitting gets half the reward of that who prays while standing; and whoever prays while Lying gets half the reward of that who prays while sitting.' "