895. hadíth
وَ سُئِلَ اَلصَّادِقُ عَلَيْهِ اَلسَّلاَمُ عَنِ اَلْمُكَاتَبِ فَقَالَ "يَجُوزُ عَلَيْهِ مَا شَرَطْتَ عَلَيْهِ ".
Imam Jafar ibn Muhammad Al-Sadiq (a.s) was asked about a mukatab (a slave under a contract of emancipation). Imam (a.s) said: "What you have stipulated upon him is binding."