Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
muslim:1080oIbn Mahdī > Sufyān

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.  

مسلم:١٠٨٠oوَحَدَّثَنِيهِ مُحَمَّدُ بْنُ حَاتِمٍ حَدَّثَنَا ابْنُ مَهْدِيٍّ عَنْ سُفْيَانَ

عَنِ الأَسْوَدِ بْنِ قَيْسٍ بِهَذَا الإِسْنَادِ وَلَمْ يَذْكُرْ لِلشَّهْرِ الثَّانِي ثَلاَثِينَ