"What I fasted with the Prophet that was twenty-nine (days), was more than what we fasted that was thirty." (He said): There are narrations on this topic from ʿUmar, Abu Hurairah, ʿA'isha, Saʿd bin Abi Waqqas, Ibn ʿAbbas, Ibn ʿUmar, Anas, Jabir, Umm Salamah, Abu Bakrah, that the Prophet ﷺ said: "The month is twenty nine (days)."  

مَا صُمْتُ مَعَ النَّبِيِّ ﷺ تِسْعًا وَعِشْرِينَ أَكْثَرُ مِمَّا صُمْنَا ثَلاَثِينَ قَالَ وَفِي الْبَابِ عَنْ عُمَرَ وَأَبِي هُرَيْرَةَ وَعَائِشَةَ وَسَعْدِ بْنِ أَبِي وَقَّاصٍ وَابْنِ عَبَّاسٍ وَابْنِ عُمَرَ وَأَنَسٍ وَجَابِرٍ وَأُمِّ سَلَمَةَ وَأَبِي بَكْرَةَ أَنَّ النَّبِيَّ ﷺ قَالَ الشَّهْرُ يَكُونُ تِسْعًا وَعِشْرِينَ  

"The Messenger of Allah vowed to stay away from his wives for a month, so he stayed in a loft for twenty-nine days. They said: 'O Messenger of Allah, your vow was for a month,' so he said: 'The month is twenty-nine (days).'"  

أَنَّهُ قَالَ آلَى رَسُولُ اللَّهِ ﷺ مِنْ نِسَائِهِ شَهْرًا فَأَقَامَ فِي مَشْرُبَةٍ تِسْعًا وَعِشْرِينَ يَوْمًا قَالُوا يَا رَسُولَ اللَّهِ إِنَّكَ آلَيْتَ شَهْرًا فَقَالَ الشَّهْرُ تِسْعٌ وَعِشْرُونَ