Sahih Muslim
The Book on Government (Kitab Al-Imara)
Book Number: 020 / Hadith Number: 4730
It has been narrated (through a different chain of tranmitten) on the authority of Jabir who said: The Messenger of Allah (may peace be upon him) forbade that a man should come to his family like (an unexpected) night visitor doubting their fidelity and spying into their lapses.