Mukhtasar Bukhari

Narrated Abu Huraira (may Allah be pleased with him): The Messenger of Allah (peace and blessings of Allah be upon him) used to say: "There are three types of people whom Allah will neither look at on the Day of Resurrection nor purify them (from their sins), and for them is a severe punishment: (1) A person who has surplus water while on the road but withholds it from a traveler in need; (2) A person who pledges allegiance to an Imam only for worldly gain—if he is given something of this world, he is pleased, but if he is not given, he is displeased; (3) A person who, after the Asr prayer, stands to sell his goods and swears by Allah—besides whom there is no deity—that he paid such and such a price for it, and someone believes him (and buys it). Then the Prophet (peace be upon him) recited this verse: 'Indeed, those who exchange the covenant of Allah and their oaths for a small price...' to the end of the verse. (Aal-e-Imran: 77)"