Sahih MuslimChapter 13Hadith 2512
Full Sharh — Sahih Muslim 2512
وَحَدَّثَنِيهِ مُحَمَّدُ بْنُ حَاتِمٍ، حَدَّثَنَا ابْنُ مَهْدِيٍّ، عَنْ سُفْيَانَ، عَنِ الأَسْوَدِ بْنِ قَيْسٍ، بِهَذَا الإِسْنَادِ وَلَمْ يَذْكُرْ لِلشَّهْرِ الثَّانِي ثَلاَثِينَ .
English Translation
This hadith has been narrated on the authority of Aswad b. Qais with the same chain of transmitters, but herein no mention has been made of the other month (consisting of) thirty days
Source
Sahih Muslim(صحيح مسلم)
The Book of Fasting
Hadith Number
2512