Sahih Muslim
Sahih Muslim 1083
حَدَّثَنَا عَبْدُ بْنُ حُمَيْدٍ، أَخْبَرَنَا عَبْدُ الرَّزَّاقِ، أَخْبَرَنَا مَعْمَرٌ، عَنِ الزُّهْرِيِّ، أَنَّ النَّبِيَّ صلى الله عليه وسلم أَقْسَمَ أَنْ لاَ يَدْخُلَ عَلَى أَزْوَاجِهِ شَهْرًا - قَالَ الزُّهْرِيُّ - فَأَخْبَرَنِي عُرْوَةُ عَنْ عَائِشَةَ - رضى الله عنها - قَالَتْ لَمَّا مَضَتْ تِسْعٌ وَعِشْرُونَ لَيْلَةً أَعُدُّهُنَّ دَخَلَ عَلَىَّ رَسُولُ اللَّهِ صلى الله عليه وسلم - قَالَتْ بَدَأَ بِي - فَقُلْتُ يَا رَسُولَ اللَّهِ إِنَّكَ أَقْسَمْتَ أَنْ لاَ تَدْخُلَ عَلَيْنَا شَهْرًا وَإِنَّكَ دَخَلْتَ مِنْ تِسْعٍ وَعِشْرِينَ أَعُدُّهُنَّ فَقَالَ " إِنَّ الشَّهْرَ تِسْعٌ وَعِشْرُونَ " .
Al-Zuhri reported that the Prophet swore not to visit his wives for a month. Al-Zuhri said that Urwa informed him, from Aisha, who said: When twenty-nine nights had passed, which I had counted, the Messenger of Allah came to me—he began with me. I said, “Messenger of Allah, you swore not to come to us for a month, yet you came after twenty-nine nights, which I counted.” He replied, “The month is twenty-nine days.”