Sahih Bukhari Volume 7, Book 67, Hadith 5189

حَدَّثَنَا أَبُو نُعَيْمٍ، حَدَّثَنَا سُفْيَانُ، عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـ قَالَ كُنَّا نَتَّقِي الْكَلاَمَ وَالاِنْبِسَاطَ إِلَى نِسَائِنَا عَلَى عَهْدِ النَّبِيِّ صلى الله عليه وسلم هَيْبَةَ أَنْ يُنْزَلَ فِينَا شَىْءٌ فَلَمَّا تُوُفِّيَ النَّبِيُّ صلى الله عليه وسلم تَكَلَّمْنَا وَانْبَسَطْنَا‏

Narrated By Ibn 'Umar : During the lifetime of the Prophet we used to avoid chatting leisurely and freely with our wives lest some Divine inspiration might be revealed concerning us. But when the Prophet had died, we started chatting leisurely and freely (with them).