Sayyiduna Irbad bin Sariyah al-Sulami (may Allah be pleased with him) said: I sold a camel to the Messenger of Allah (peace and blessings be upon him). I came to the Messenger of Allah (peace and blessings be upon him) to demand payment and said: O Messenger of Allah! Pay me the price of my camel. He (peace and blessings be upon him) said: "I will give you a Bukhti camel." Then he (peace and blessings be upon him) repaid me in the best manner. Then a Bedouin came and said: Give me my camel. He (peace and blessings be upon him) gave him a mature camel, and the Bedouin said: This is better than my camel. He (peace and blessings be upon him) said: "The best people are those who are best in repaying."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10941