Sunan Abi Dawud, Book 3, Hadith 789 (USC-MSA) ⓘ
‘Ammar b. Yasir said: I heard the apostle of Allah say: A man returns after saying his prayer while a tenth part of his prayer, or a ninth part, or an eight part, or a seventh part, or a sixth part, or a fifth part, or a third part, or half of it, is recorded for him.
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، عَنْ بَكْرٍ، - يَعْنِي ابْنَ مُضَرَ - عَنِ ابْنِ عَجْلاَنَ، عَنْ سَعِيدٍ الْمَقْبُرِيِّ، عَنْ عُمَرَ بْنِ الْحَكَمِ، عَنْ عَبْدِ اللَّهِ بْنِ عَنَمَةَ الْمُزَنِيِّ، عَنْ عَمَّارِ بْنِ يَاسِرٍ، قَالَ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ " إِنَّ الرَّجُلَ لَيَنْصَرِفُ وَمَا كُتِبَ لَهُ إِلاَّ عُشْرُ صَلاَتِهِ تُسْعُهَا ثُمُنُهَا سُبُعُهَا سُدُسُهَا خُمُسُهَا رُبُعُهَا ثُلُثُهَا نِصْفُهَا " .
also referenced under: Hadith 796 (DarusSalam) & Hadith 789 (Hasan)