The Book of Fasting
22/15. Chapter:
Mentioning The Report Of Ibn 'Abbas about That
Sunan an-Nasai
أَخْبَرَنَا مُحَمَّدُ بْنُ بَشَّارٍ، عَنْ مُحَمَّدٍ، وَذَكَرَ، كَلِمَةً مَعْنَاهَا حَدَّثَنَا شُعْبَةُ، عَنْ سَلَمَةَ، قَالَ سَمِعْتُ أَبَا الْحَكَمِ، عَنِ ابْنِ عَبَّاسٍ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " الشَّهْرُ تِسْعٌ وَعِشْرُونَ يَوْمًا " .
It was narrated that Ibn 'Abbas said: "The Messenger of Allah said: 'The month is twenty-nine days."'
Reference : Sunan an-Nasa'i 2134In-book reference : Book 22, Hadith 45English translation : Vol. 3, Book 22, Hadith 2136