عَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ: ((لَا يَنْظُرُ اللَّهُ إِلَى صَلَاةِ رَجُلٍ لَا يُقِيمُ صُلْبَهُ بَيْنَ رُكُوعِهِ وَسُجُودِهِ))
It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: Allah Almighty does not look towards the prayer of the person who does not straighten his back in bowing (ruku) and prostration (sajdah).