‘Amr b. Shu'aib, on his father’s authority, told that his grandfather reported God's Messenger as saying, “If anyone has agreed to let his slave buy his freedom for a hundred uqiyas and he pays them all but ten (or he said, ten dinars), and he is then unable to complete the amount, he remains a slave.” Tirmidhi, Abu Dawud and Ibn Majah transmitted it.
Hadith Referenceمشكوة المصابيح / كتاب العتق / 3401
Hadith Gradingالألبانی:لم تتمّ دراسته | زبیر علی زئی:حسن
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «حسن، رواه الترمذي (1260 و قال: غريب) و أبو داود (3927) و ابن ماجه (2519)»