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:6171Abū al-Ḥusayn ʿAlī b. Muḥammad b. ʿAbdullāh b. Bishrān al-ʿAdl> Abū Jaʿfar Muḥammad b. ʿAmr b. al-Bakhtarī al-Razzāz > Aḥmad b. al-Walīd al-Faḥḥām > Abū Aḥmad al-Zubayrī

[Machine] The Messenger of Allah ﷺ would make seven takbeers on the two Eids, on the day of Eid al-Fitr and on the day of Eid al-Adha. He would make seven takbeers in the first Eid and five takbeers in the second Eid, excluding the takbeer of the prayer.  

البيهقي:٦١٧١أَخْبَرَنَا أَبُو الْحُسَيْنِ عَلِيُّ بْنُ مُحَمَّدِ بْنِ عَبْدِ اللهِ بْنِ بِشْرَانَ الْعَدْلُ بِبَغْدَادَ أنبأ أَبُو جَعْفَرٍ مُحَمَّدُ بْنُ عَمْرِو بْنِ الْبَخْتَرِيِّ الرَّزَّازُ ثنا أَحْمَدُ بْنُ الْوَلِيدِ الْفَحَّامُ ثنا أَبُو أَحْمَدَ الزُّبَيْرِيُّ ثنا عَبْدُ اللهِ بْنُ عَبْدِ الرَّحْمَنِ بْنِ يَعْلَى الثَّقَفِيُّ أَخْبَرَنِي عَمْرُو بْنُ شُعَيْبٍ عَنْ أَبِيهِ عَنْ جَدِّهِ

أَنَّ رَسُولَ اللهِ ﷺ كَبَّرَ فِي الْعِيدَيْنِ يَوْمَ الْفِطْرِ وَيَوْمَ الْأَضْحَى سَبْعًا وَخَمْسًا فِي الْأُولَى سَبْعًا وَفِي الْآخِرَةِ خَمْسًا سِوَى تَكْبِيرَةِ الصَّلَاةِ