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