I asked, "Messenger of Allah, which people face the most severe trials?"He replied, "The prophets, then those who most resemble them, then those who most resemble them. A person is tested according to the strength of his faith. If his faith is firm, his trial is severe, and if there is weakness in his faith, he is tested according to the measure of his faith. Trials continue to afflict the servant until they leave him walking upon the earth with no sin upon him."
قلت: يا رسول الله! أي الناس أشد بلاء؟ قال: الأنبياء، ثم الأمثل، فالأمثل، فيبتلى الرجل على حسب دينه، فإن كان دينه صلبا اشتد بلاؤه، وإن كان في دينه رقة ابتلي على حسب دينه، فما يبرح البلاء بالعبد حتى يتركه يمشي على الأرض ما عليه خطيئة.
Tirmidhi (2398), Ibn Majah (4023), and Ahmad (1481) all narrated it through Hammad bin Zayd, from Asim, from Musab bin Saad, from his father Saad bin Abu Waqqas, and he mentioned it. Ibn Hibban graded it sahih (2900).Tirmidhi said, "Hasan sahih."I say, its isnad is hasan only, because Asim, who is Ibn Bahdala, his hadiths are hasan.