The Messenger of Allah ﷺ would say the takbir (Allah is most great) seven times in the first rak'ah and five times in the second rak'ah on the day of the breaking of the fast and on the day of sacrifice (on the occasion of both the 'Id prayers, the two festivals).

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ يُكَبِّرُ فِي الْفِطْرِ وَالأَضْحَى فِي الأُولَى سَبْعَ تَكْبِيرَاتٍ وَفِي الثَّانِيَةِ خَمْسًا

[AI] The Messenger of Allah ﷺ used to perform Takbeer in the two Eids, seven times before the recitation.

أَنَّ رَسُولَ اللهِ ﷺ كَانَ يُكَبِّرُ فِي الْعِيدَيْنِ سَبْعًا وَخَمْسًا قَبْلَ الْقِرَاءَةِ

Kathir bin ‘Abdullah bin ‘Amr bin ‘Awf narrated, from his father, from his grandfather, that the Messenger of Allah ﷺ said the Takbir in the ‘Eid prayers, seven times in the first Rak’ah and five times in the second. (Using translation from Ibn Mājah 1279)

أَنَّ رَسُولَ اللهِ ﷺ كَانَ يُكَبِّرُ فِي الْعِيدَيْنِ سَبْعًا فِي الرَّكْعَةِ الْأُولَى وَخَمْسًا فِي الْآخِرَةِ سِوَى تَكْبِيرَتَيِ الرُّكُوعِ

[AI] She said, "The Prophet ﷺ used to recite the takbeer (Allahu Akbar) seven times on the first day of Eid and five times on the second day before the prayer."

أَنَّهَا قَالَتْ «كَانَ النَّبِيُّ ﷺ يُكَبِّرُ فِي الْعِيدَيْنِ فِي الْأُولَى سَبْعَ تَكْبِيرَاتٍ وَفِي الثَّانِيَةِ خَمْسَ تَكْبِيرَاتٍ قَبْلَ الْقِرَاءَةِ»

[AI] That the imam should say seven takbirs before recitation in the first (unit of prayer) and five takbirs before recitation in the second (unit of prayer).

أَنْ يُكَبِّرَ الْإِمَامُ فِي الْأُولَى سَبْعَ تَكْبِيرَاتٍ قَبْلَ الْقِرَاءَةِ وَيُكَبِّرَ فِي الرَّكْعَةِ الثَّانِيَةِ خَمْسَ تَكْبِيرَاتٍ قَبْلَ الْقِرَاءَةِ

[AI] That the Messenger of Allah ﷺ used to say Takbir (Allahu Akbar) seven times in the first rak'ah and five times in the second rak'ah before recitation on the two Eids.

أَنَّ رَسُولَ اللهِ ﷺ كَانَ يُكَبِّرُ فِي الْعِيدَيْنِ فِي الرَّكْعَةِ الْأُولَى سَبْعَ تَكْبِيرَاتٍ وَفِي الرَّكْعَةِ الثَّانِيَةِ خَمْسَ تَكْبِيرَاتٍ قَبْلَ الْقِرَاءَةِ

[AI] The Messenger of Allah ﷺ used to recite takbeer seven times on the first Eid and five times on the second Eid before the prayer.

كَانَ رَسُولُ اللهِ ﷺ يُكَبِّرُ فِي الْعِيدَيْنِ فِي الْأُولَى سَبْعَ تَكْبِيرَاتٍ وَفِي الثَّانِيَةِ خَمْسَ تَكْبِيرَاتٍ قَبْلَ الْقِرَاءَةِ

[AI] "To recite seven takbirs in the first rakah before the recitation, and to recite five takbirs in the second rakah before the recitation."

أَنْ يُكَبِّرَ الْإِمَامُ فِي الرَّكْعَةِ الْأُولَى سَبْعَ تَكْبِيرَاتٍ قَبْلَ الْقِرَاءَةِ وَيُكَبِّرَ فِي الرَّكْعَةِ الثَّانِيَةِ خَمْسَ تَكْبِيرَاتٍ قَبْلَ الْقِرَاءَةِ

[AI] The Prophet ﷺ would make takbeer during the two Eids. He would make takbeer seven times during the first Eid (Eid al-Fitr) and five times during the second Eid (Eid al-Adha). He would make takbeer before the prayer and continue walking to the prayer area, and then walk back.

أَنَّ رَسُولَ اللهِ ﷺ كَبَّرَ فِي الْعِيدَيْنِ فِي الْأُولَى سَبْعًا وَفِي الْآخِرَةِ خَمْسًا وَكَانَ يُكَبِّرُ قَبْلَ الْقِرَاءَةِ وَذَهَبَ مَاشِيًا وَرَجَعَ مَاشِيًا

"التَّكْبير في العِيدَين في الركعَةِ الأولى سبعُ تكبيرات، وفي الأخيرة خمسُ تكبيرات".