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)."  

قَالَ رَسُولُ اللَّهِ ﷺ وَلَكِنَّهُ قَالَ السُّنَّةُ إِذَا تَزَوَّجَ الرَّجُلُ الْبِكْرَ عَلَى امْرَأَتِهِ أَقَامَ عِنْدَهَا سَبْعًا وَإِذَا تَزَوَّجَ الثَّيِّبَ عَلَى امْرَأَتِهِ أَقَامَ عِنْدَهَا ثَلاَثًا قَالَ وَفِي الْبَابِ عَنْ أُمِّ سَلَمَةَ