Sulayman bin Yasar says: I sought permission to enter upon Sayyidah Aishah (may Allah be pleased with her). She asked: Who is it? I said: Sulayman. She asked: How much of your contract of manumission (mukatabah) remains? I said: 10 uqiyahs. She said: Come in. You are still a slave as long as even one dirham remains due from you.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب المكاتب / 21645