It is narrated from Sayyiduna Abu Malik al-Ash'ari (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Trial (fitnah) is sent, and desire and patience are sent along with it. Whoever follows desire, his death will be black, and whoever follows patience, his death will be white."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 3433