Sahih Al Bukhari Hadith Number 1116

Narrated `Abdullah bin Buraida: `Imran bin Husain had piles. Once Abu Ma mar narrated from `Imran bin Husain had said, “I asked the Prophet (peace be upon him) 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.’ “

18  Shortening the Prayers (At-Taqseer)
Hadith number 1116
Volume no 2
Chapter: 18 ( To offer Salat (prayers) by signs while sitting)