Ibn Sirin (may Allah have mercy on him) said: On the occasion of his marriage my father invited the people to food for eight days. He had also invited Sayyiduna Ubayy bin Ka'b (may Allah be pleased with him), who was fasting on the day he came. He made a supplication, that is, he supplicated for blessing, and then left.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصداق / 14516