Hadith Qudsi Number 021 : The Authority Of Abu Hurayrah

The Messenger of Allah (peace be upon him) said that Allah the Almighty said : "There are three (1) whose adversary I shall be on the Day of Resurrection : a man who has given his word by Me and has broken it; a man who has sold a free man (2) and has consumed the price; and a man who has hired a workman, has exacted his due in full from him and has not given him his wage."

(1) i.e. types of men.
(2) i.e. a man who has made a slave of another and has sold him.

It was related by al-Bukhari (also by Ibn Majah and Ahmad ibn Hanbal).