It was narrated from ‘Aishah that the Messenger of Allah ﷺ said the Takbir seven and five times in (the prayer for ‘Eid) Fitr and Adha, apart from the Takbir for Ruku’ (bowing).
أَنَّ رَسُولَ اللَّهِ ﷺ كَبَّرَ فِي الْفِطْرِ وَالأَضْحَى سَبْعًا وَخَمْسًا سِوَى تَكْبِيرَتَىِ الرُّكُوعِ
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