حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ عَنْ مُحَمَّدِ بْنِ عَمْرٍو أَخْبَرَنِي يَحْيَى بْنُ عَبْدِ الرَّحْمَنِ عَنِ ابْنِ عُمَرَ عَنْ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ الشَّهْرُ تِسْعٌ وَعِشْرُونَ فَذَكَرُوا ذَلِكَ لِعَائِشَةَ فَقَالَتْ يَرْحَمُ اللَّهُ أَبَا عَبْدِ الرَّحْمَنِ وَهَلْ هَجَرَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ نِسَاءَهُ شَهْرًا فَنَزَلَ لِتِسْعٍ وَعِشْرِينَ فَقِيلَ لَهُ فَقَالَ إِنَّ الشَّهْرَ قَدْ يَكُونُ تِسْعًا وَعِشْرِينَ
مسند امام احمد بن حنبل · Hadith 5182
It was narrated from Ibn Umar that the Prophet (PBUH) said: 'The month is twenty-nine" They optioned that to 'Aa'ishah and gbe said: May Allah have mercy on Abu 'Abd ar-Rahmaan, for he must have got confused. Rather the Messenger of Allah (PBUH) stayed away from his wives for a month, then he came down (from the toft in which he stayed during that time) at the end of twenty-nine days. They said something to him about that, and he said: "The month may be twenty-nine days."
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020