Abu Dawud
Book Of Emancipation Of Slaves
Book Number: 024 / Hadith Number: 3916
Narated By Abdullah ibn Amr ibn al-'As : The Prophet (pbuh) 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: The narrator 'Abbas al-Jariri is not the same person. They said: It is a misunderstanding. He is some other narrator.