Sayyiduna Anas (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) used to visit the Ansar. He also related the story of his entering the house of Sa'd bin Ubadah (may Allah be pleased with him).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصداق / 14674