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)."
Reference: Jami` at-Tirmidhi 1139 In-book : Book 11, Hadith 61 English translation : Vol. 2, Book 6, Hadith 1139
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