'Abdullah bin Umar (may Allah be pleased with them both) says: I heard the Messenger of Allah (peace and blessings of Allah be upon him) say during a sermon: "Whoever makes a contract of manumission with his slave for one hundred uqiyyah (twelve hundred dirhams), and the slave pays all except ten uqiyyah, then is unable to pay the remainder, he remains a slave."
© Imam Tirmidhi says:
1- This hadith is hasan ghareeb.
2- Hajjaj bin Arta'ah has also narrated a similar hadith from Amr bin Shu'aib.
3- Most of the companions and other scholars act upon this, that as long as any amount of the contract remains unpaid by the slave, he remains a slave.
Related hadith on this topic
Explanation & Benefits
Maulana Ataullah Sajid
Benefits and Issues:
➊ There are many legal (shar‘i) matters in which slaves and free people differ; therefore, a person who has not yet attained complete freedom will still be subject to the rulings applicable to slaves.
➋ When a mukatab (contracted slave) completes the payment, he becomes free, and the laws applicable to free individuals will then apply to him.
Source: Commentary on Sunan Ibn Mājah by Mawlānā ‘Atā’ullāh Sājid, Page: 2519