Wedlock, Marriage (Nikaah)

Bukhari :: Book 7 :: Volume 62 :: Hadith 146

Narrated Asma:

Some lady said, "O Allah's Apostle! My husband has another wife, so it is sinful of me to claim that he has given me what he has not given me (in order to tease her)?" Allah's Apostle said, The one who pretends that he has been given what he has not been given, is just like the (false) one who wears two garments of falsehood."