Sayyiduna Abu Hurayrah (may Allah be pleased with him) said that a man came to the Messenger of Allah (peace and blessings be upon him) and asked, and he (peace and blessings be upon him) asked for a loan of half a wasq, and the man gave it to him (peace and blessings be upon him). Then the man came demanding repayment of the loan, and he (peace and blessings be upon him) gave him one wasq and said: "Half is the repayment of the loan, and half is from me."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10940