The Messenger of Allah ﷺ said, "How wonderful is the affair of the believer. Allah never decrees anything for him except that it is good for him."
حدثنا نوح بن حبيب حدثنا حفص بن غياث بن طلق بن معاوية عن عاصم الأحول عن ثعلبة بن عاصم
قال رسول الله ﷺ عجبا للمؤمن لا يقضي الله له شيئا إلا كان خيرا له
No references are available.
Its isnad is sahih, mentioned previously at 18841.