(18) باب صَلاَةِ الْقَاعِدِ بِالإِيمَاءِ
Narrated `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.' "
Reference: Sahih al-Bukhari 1116
In-book reference: Book 18, Hadith 36
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 2, Book 20, Hadith 217