Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates that the Messenger of Allah (peace and blessings be upon him) said: "Among the greatest sins in the sight of Allah is that a man marries a woman and, after fulfilling his need from her, divorces her and also takes away her dowry; and a man who employs someone and then takes away his wages; and the one who kills an animal for no purpose."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصداق / 14395
Sayyiduna Abu Hurayrah (may Allah be pleased with him) says: I heard the Messenger of Allah (peace and blessings be upon him); he (peace and blessings be upon him) said: "Love of the Ansar is faith and hatred of the Ansar is disbelief; and whoever marries a woman on a dowry but does not intend to pay it is a fornicator."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصداق / 14396
Sayyiduna Suhayb bin Sinan (may Allah be pleased with him) narrates from the Messenger of Allah (peace and blessings be upon him): "Whoever fixes a dowry for a woman while Allah knows that he does not intend to pay it to her has deceived her in the name of Allah and made her private part lawful for himself by falsehood; he will meet Allah on the Day of Resurrection as a fornicator."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصداق / 14397