Mukhtasar Muslim

Lady Asma (may Allah be pleased with her) says that a woman came to the Prophet (peace and blessings be upon him) and said, "I have a co-wife. Will I be sinful if I say (to provoke her) that my husband has given me such-and-such, even though he has not given it to me?" The Prophet (peace and blessings be upon him) replied, "Whoever claims to have been given something which she was not given, it is as if she is wearing two garments of falsehood (and presents herself as pious and righteous, while in reality she is worldly and deceitful). There is no power and no strength except with Allah."