The Prophet ﷺ said, "The best among you in Islam are those with the finest character, once they have gained understanding of the religion."
حدثنا وكيع قال حدثنا حماد بن سلمة عن محمد بن زياد
عن النبي ﷺ قال خيركم في الإسلام أحاسنكم أخلاقا إذا فقهوا
Its isnad is sahih, it was mentioned previously at 10022.