Sayyiduna Usamah bin Sharik (may Allah be pleased with him) says: I came to the Messenger of Allah (peace and blessings be upon him), and the Companions (may Allah be pleased with them) were sitting as though birds were perched on their heads. I gave the greeting of peace and sat down. Then a Bedouin came and said: "O Messenger of Allah! Shall we treat ourselves with medicine?" He (peace and blessings be upon him) said: "Seek treatment, for Allah has placed a cure for every disease, except old age." The narrator says: He asked about some other things, and he (peace and blessings be upon him) said: "There is no harm." He (peace and blessings be upon him) said: "Servants of Allah! Allah has removed hardship, except for the one who wrongs others; that is a cause of ruin and distress." He said: "O Messenger of Allah! What is the best thing that people have been given?" He (peace and blessings be upon him) said: "Good character."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19559