Sahih Bukhari Volume 9, Book 91, Hadith Number 363.

Narrated By Ali : The Prophet , sent an army and appointed some man their commander The man made a fire and then said (to the soldiers), “Enter it.” Some of them intended to enter it while some others said, ‘We have run away from it (i.e., embraced Islam to save ourselves from the ‘fire’).” They mentioned that to the Prophet, and he said about people who had intended to enter the fire. ”If they had entered it, they would have remained In it till the Day of Resurrection.” Then he said to others, “No obedience for evil deeds, obedience is required only in what is good.”