Salim bin Abdullah (may Allah have mercy on him) says: Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) was asked about a man who is owed a debt by someone, due at a fixed term, and the creditor waives part of the debt and takes it before the due time. Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) disliked it and forbade it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 11139