Abu Qilabah narrated from Anas bin Malik, : 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)”"
SahihSahihHasan SahihBook 11 · Hadith 61