حَدَّثَنَا أَبُو كُرَيْبٍ، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ نُمَيْرٍ، وَمُحَمَّدُ بْنُ فُضَيْلٍ، عَنْ حَجَّاجٍ، عَنْ عَمْرِو بْنِ شُعَيْبٍ، عَنْ أَبِيهِ، عَنْ جَدِّهِ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ أَيُّمَا عَبْدٍ كُوتِبَ عَلَى مِائَةِ أُوقِيَّةٍ فَأَدَّاهَا إِلاَّ عَشْرَ أُوقِيَّاتٍ فَهُوَ رَقِيقٌ ‏"‏ ‏.‏

It was narrated from `Amr bin Shu'aib , from his father, from his grandfather that the Messenger of Allah (PBUH) said: “Any slave who has made a contract to buy his freedom for one hundread Uqiyyah and pays it all except ten Uqiyyah; he is still a slave.” (One Uqiyyah is equal to 40 Dirham.) Translation Not Available

Book reference: Sunan Ibn Majah Book 19 Hadith 2519
Web reference: Sunan Ibn Majah Volume 3 Book 19 Hadith 2519