سنن ابن ماجه

It was narrated from ‘Imran bin Husain that he asked the Messenger of Allah (ﷺ) about a man who prays sitting down. He said, “Whoever performs prayer standing up, that is better. Whoever performs prayer sitting down will have half the reward of one who prays standing. And whoever performs prayer lying down will have half the reward of one who prays sitting.”