The prayer of the one who sits is equivalent to half of the Prayer of one who stands Sunan Ibn Majah 1229
Arabic hadith text
حَدَّثَنَا عُثْمَانُ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا يَحْيَى بْنُ آدَمَ، حَدَّثَنَا قُطْبَةُ، عَنِ الأَعْمَشِ، عَنْ حَبِيبِ بْنِ أَبِي ثَابِتٍ، عَنْ عَبْدِ اللَّهِ بْنِ بَابَاهْ، عَنْ عَبْدِ اللَّهِ بْنِ عَمْرٍو، أَنَّ النَّبِيَّ ـ صلى الله عليه وسلم ـ مَرَّ بِهِ وَهُوَ يُصَلِّي جَالِسًا فَقَالَ " صَلاَةُ الْجَالِسِ عَلَى النِّصْفِ مِنْ صَلاَةِ الْقَائِمِ "
Translation
It wasnarrated from ‘Abdullah bin ‘Amr that the Prophet (ﷺ) passedbyhim when he was praying sitting down. He said
“The prayer of onewho sits down is equivalent to half of the prayer of one who stands.”