I heard the Messenger of Allah ﷺ say, "A man may finish his prayer and have only a tenth of it recorded for him, or a ninth, an eighth, a seventh, a sixth, a fifth, a fourth, a third, or a half."
سمعت رسول الله ﷺ يقول: إن الرجل لينصرف، و ما كتب إلا عشر صلاته، تسعها، ثمنها، سبعها، سدسها، خمسها، ربعها، ثلثها، نصفها.
Abu Dawud (796), Nasai in Al-Kubra (651), and Ahmad (18894) all narrated it through the route of Muhammad bin Ajlan, from Saeed Maqburi, from Umar bin Hakam, from Abdullah bin Anamah Muzani, from Ammar bin Yasir, who then mentioned it. Its chain is hasan because of Muhammad bin Ajlan, for he is hasan al-hadith.