Sayyidah Asma bint Abi Bakr (may Allah be pleased with her) says that a woman came to the Messenger of Allah (peace and blessings be upon him) and said: I have a co-wife; is it right for me to say that my husband has given me such-and-such, when he has not given me anything? The Messenger of Allah (peace and blessings be upon him) said: "Making a display of what one has not been given is like wearing two garments of falsehood."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب القسم والنشوز / 14795