سنن النسائي

It was narrated that Abu Sa'eed Al-Khudri said: "in the year of Tabuk, the Messenger of Allah (ﷺ) addressed the people, while leaning against his mount. He said: 'Shall I not tell you of the best of the people and the worst of the people? Among the best of the people is a man who strives in the cause of Allah on the back of his horse, or on the back of his camel, or on his own two feet, until death comes to him. And among the worst of the people, is an immoral man (Fajir) who reads the Book of Allah but he does not refrain from doing anything bad because of it.'"