Sunan Abu Dawud
951
Sahih+3

‘Abd Allah b. Buraidah said :‘Imran b. Hussain asked the prophet (ﷺ) about the prayer a man offers in sitting condition. He replied: his prayer in standing condition is better than his prayer in sitting condition, and his prayer in sitting condition is half the prayer he offers in standing condition, and his prayer in lying condition is half the prayer he offers in sitting condition

SahihAl-Albani
SahihMuhammad Muhyi Al-Din Abdul Hamid