Jubayr bin Nufayr (may Allah have mercy on him) said: Sayyiduna al-Miqdad bin al-Aswad (may Allah be pleased with him) came to us for some need of his, and we said: "May Allah grant you well-being; sit down until you have your need fulfilled." He said: "How strange are some people I passed by just now! They wish for tribulation, claiming that Allah will test them in it as He tested His Messenger (peace and blessings be upon him) and his (peace and blessings be upon him) Companions. By Allah, I heard the Messenger of Allah (peace and blessings be upon him) say: 'The fortunate one is indeed he who is kept away from tribulations' - he (peace and blessings be upon him) repeated this three times - 'and if he is tested, he is patient.' And by Allah, I do not testify that anyone is among the people of Paradise until I know what state he died in, because of a hadith I heard from the Messenger of Allah (peace and blessings be upon him). I heard the Messenger of Allah (peace and blessings be upon him) say: 'The heart of the son of Adam turns over more swiftly than a cooking pot when it comes to a full boil.'"
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17732