Musnad Ahmad 28:250

'Abd al-Samad narrated to us, Hammam narrated to us, 'Abbas al-Jazari narrated to us, 'Amr ibn Shu'ayb narrated from his father, from his grandfather, that the Prophet (peace and blessings of Allah be upon him) said: "Any slave who enters into a contract of manumission (kitabah) for one hundred ounces, then pays it off except for ten ounces, he is a slave. And any slave who enters into a contract of manumission for one hundred dinars, then pays it off except for ten dinars, he is a slave." ['Abdullah ibn Ahmad said]: "Thus did 'Abd al-Samad say: 'Abbas al-Jazari. In the manuscript it was: 'Abbas al-Jariri, but my father corrected it, as 'Abd al-Samad said: al-Jazari."