Arabic (Original)
أَخْبَرَنَا مُحَمَّدُ بْنُ عُمَرَ بْنِ يُوسُفَ قَالَ حَدَّثَنَا بِشْرُ بْنُ خَالِدٍ قَالَ حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ عَنْ شُعْبَةَ قَالَ سَمِعْتُ سُلَيْمَانَ قَالَ سَمِعْتُ عُمَارَةَ بْنَ عُمَيْرٍ عَنْ أَبِي مَعْمَرٍ عَنْ أَبِي مَسْعُودٍ قَالَ قَالَ رَسُولُ اللَّهِ ﷺ «لَا تُجْزِئُ صَلَاةٌ لِأَحَدٍ لَا يُقِيمُ صُلْبَهُ فِي الرُّكُوعِ وَالسُّجُودِ»
English Translation
Muhammad ibn Umar ibn Yusuf informed us, saying: Bishr ibn Khalid narrated to us, saying: Muhammad ibn Ja'far narrated to us from Shu'bah, who said: I heard Sulayman, who said: I heard Umarah ibn Umayr from Abu Ma'mar from Abu Mas'ud, who said: The Messenger of Allah (peace and blessings be upon him) said: 'The prayer of one who does not straighten his back in the bowing and prostration is not valid.'