عَنْ عَبْدِ اللَّهِ بْنِ أَبِي قَتَادَةَ عَنْ أَبِيهِ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ: ((أَسْوَأُ النَّاسِ سَرِقَةً الَّذِي يَسْرِقُ مِنْ صَلَاتِهِ)) قَالُوا: يَا رَسُولَ اللَّهِ! وَكَيْفَ يَسْرِقُ مِنْ صَلَاتِهِ؟ قَالَ: ((لَا يُتِمُّ رُكُوعَهَا وَلَا سُجُودَهَا أَوْ قَالَ لَا يُقِيمُ صُلْبَهُ فِي الرُّكُوعِ وَالسُّجُودِ))
It is narrated from Sayyiduna Abu Qatadah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: The worst person in terms of theft is the one who steals from his prayer. The people asked: O Messenger of Allah! How does he steal from his prayer? He (peace and blessings be upon him) said: He does not complete the bowing and prostration, or he said: He does not straighten his back in bowing and prostration.