Indeed, a servant may pray a prayer, but nothing of it is recorded for him except a tenth of it, or a ninth, or an eighth, or a seventh, or a sixth, or a fifth, or a quarter, or a third, or a half

عَنْ عَبْدِ اللهِ بْنِ عَنَمَةَ، قَالَ: رَأَيْتُ عَمَّارَ بْنَ يَاسِرٍ دَخَلَ المَسْجِدَ فَصَلَّى، ‌فَأَخَفَّ ‌الصَّلَاةَ، قَالَ: فَلَمَّا خَرَجَ، قُمْتُ إِلَيْهِ، فَقُلْتُ: يَا أَبَا اليَقْظَانِ، لَقَدْ خَفَّفْتَ، قَالَ: فَهَلْ رَأَيْتَنِي انْتَقَصْتُ مِنْ حُدُودِهَا شَيْئًا؟! قُلْتُ: لَا، قَالَ: فَإِنِّي بَادَرْتُ بِهَا سَهْوَةَ الشَّيْطَانِ، سَمِعْتُ رَسُولَ اللهِ صلى الله عليه وسلم يَقُولُ: « إِنَّ الْعَبْدَ لَيُصَلِّي الصَّلَاةَ، مَا يُكْتَبُ لَهُ مِنْهَا إِلَّا عُشْرُهَا، تُسْعُهَا، ثُمُنُهَا، سُبُعُهَا، سُدُسُهَا، خُمُسُهَا، رُبُعُهَا، ثُلُثُهَا نِصْفُهَا».

‘Abdullah ibn ‘Anamah reported: I saw ‘Ammār ibn Yāsir enter the mosque and perform the prayer, and he performed it briefly. When he came out, I went to him and said: O Abu al-Yaqzhān, you performed the prayer briefly. He replied: Did you see me leave out any of its required parts or limits? I said: No. He said: Verily, I hastened in it to ward off the distraction of the devil. I heard the Messenger of Allah (ﷺ) say: "Indeed, a servant may pray a prayer, but nothing of it is recorded for him except a tenth of it, or a ninth, or an eighth, or a seventh, or a sixth, or a fifth, or a quarter, or a third, or a half."

Source · Narrated by Ahmad

From the Hadith Encyclopedia (hadeethenc.com).