Sayyiduna Abu Hurayrah (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: "Allah Almighty says: There are three people against whom I will be an opponent, and whoever I am an opponent against will be defeated: one who gives a pledge in My name and then betrays it; a second who sells a free man and consumes his price; and a third who hires a labourer and then does not give him his wage."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 11053