Sunan an-Nasa'i 1659
سنن النسائي#1659SahihIt was narrated that 'Abdullah bin 'Amr said:"I saw the Prophet (ﷺ) praying sitting down and I said: 'I was told that you said that the prayer of one who is sitting down is worth half of the prayer of the one who is standing up.' He said: 'Yes indeed, but I am not like any one of you
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih Muslim
In-book reference: 20:62