Sayyiduna Abu Hurayrah (may Allah be pleased with him) reports the saying of the Prophet (peace and blessings be upon him), that he (peace and blessings be upon him) said: "On the Day of Resurrection there are three men at whom Allah Almighty will not look, nor will He purify them, and for them is a painful punishment: one, the man who has surplus water on the road and withholds it from another; second, the person who pledges allegiance to the imam for the sake of the world, so that if he gives him (something) he is pleased and if he does not give him he is angry; and third, the person who sells goods after Asr by swearing an oath by Allah, and the other, thinking him truthful, buys it." Then he recited this verse: "Indeed, those who exchange the covenant of Allah and their oaths for a small price" [Surah Al Imran: 77].
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قتال أهل البغي / 16636