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.
bayhaqi:6218al-Shāfiʿī > al-Thiqah from Ahl al-Madīnah > Uthbit Lah Kitāb

[Machine] Narrated Abu Huraira: Regarding the Takbir of the Imam during the first sermon on the days of Eid ul-Fitr and Eid ul-Adha, it consists of fifty-three takbirs distributed throughout the various sections of the sermon between the two khutbahs.  

البيهقي:٦٢١٨وَبِإِسْنَادِهِ قَالَ أَخْبَرَنِي الشَّافِعِيُّ أَخْبَرَنِي الثِّقَةُ مِنْ أَهْلِ الْمَدِينَةِ أَنَّهُ أُثْبِتَ لَهُ كِتَابٌ

عَنْ أَبِي هُرَيْرَةَ فِيهِ تَكْبِيرُ الْإِمَامِ فِي الْخُطْبَةِ الْأُولَى يَوْمَ الْفِطْرِ وَالْأَضْحَى إِحْدَى أَوْ ثَلَاثٌ وَخَمْسُونَ تَكْبِيرَةً فِي فُصُولِ الْخُطْبَةِ بَيْنَ ظَهْرَانَيِ الْكَلَامِ