Sayyiduna Usamah bin Sharik (may Allah be pleased with him) said: The Bedouins came to the Prophet (peace and blessings be upon him) asking him: Is there any harm upon us in such-and-such? He (peace and blessings be upon him) said: "Allah has removed harm, except for the one who assails the honour of his brother; he is the one who has fallen into harm and is ruined." And he said: "Allah has not sent down any disease without also sending down its cure, except old age."
Hadith Referenceالمعجم الكبير للطبراني / باب الألف / 474