Sahih Bukhari
Wedlock, Marriage (Nikaah)
Volume: 007 / Book Number: 062 / Hadith Number: 147
Narrated 'Abdullah bin Masud:
The Prophet, said, "There is none having a greater sense of Ghira than Allah. And for that He has forbidden the doing of evil actions (illegal sexual intercourse etc.) There is none who likes to be praised more than Allah does."