Sunan Abi Dawud 3927
سنن أبي داود#3927HasanNarrated 'Amr b. Shu'aib: On his father's authority, told that his grandfather reported the Prophet (ﷺ) said: If any slave entered into an agreement to buy his freedom for one hundred uqiyahs and he pays them all but ten, he remains a slave (until he pays the remaining ten); and if a slave entered into an agreement to purchase his freedom for one hundred dinars, and he pays them all but ten dinars, he remains a slave (until he pays the remaining ten). Abu Dawud said: This narrator 'Abbas al-Jariri is not the same person. They said: It is misunderstanding. He is some other narrator
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniHasan
Muhammad Muhyi Al-Din Abdul HamidHasan
Shuaib Al ArnautHasan
Zubair Ali ZaiHasan
In-book reference: 31:2