Amr bin Shu'aib bin Muhammad عمرو بن شعيب بن محمد السهمي · The Book on Marriage

"Umar bin Al-Khattab said: 'Do not exaggerate in the dowries of women. If doing so was honorable in the world or Taqwa before Allah then Allah's Prophet would have been the first of you to do it. I do not know of the Messenger of Allah marrying any of his women, nor giving any of his daughters in marriage, for more than twelve Uqiyah."

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)."