Sahih Muslim Book 5, Hadith Number 2304.

Chapter : The Khwarij and their characteristics.

Anas b. Malik reported that when Allah conferred upon His Messenger (may peace be upon him) the riches of Hawazin (without armed encounter); the rest of the Hadith is the same except some variation (of words): “Anas said: We could not tolerate it and he also said: The people were immature in age.”