Nafi' (may Allah have mercy on him) narrates from Sayyiduna Ibn Umar (may Allah be pleased with them both) that he made a kitabah contract with his slave for 35 thousand and reduced 5 thousand; I think this was his last instalment.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب المكاتب / 21673