Muhammad bin Khazim al-Darir محمد بن خازم أبو معاوية الضرير · The Book on Marriage

The Messenger of Allah said: "Having food on the first day is was is obligatory, and having food on the second day is Sunnah, and having food on the third day is to be heard of, and whoever wants to be heard of, Allah will make him heard of."

He (Abu Qilabah) said: "If I wish, I could say: 'The Messenger of Allah said'" but he said: "The Sunnah when a man married a virgin after he already has a wife, is that he stays with her seven (nights). And when he married a matron when he already has a wife, he stays with her three (nights)."