It was narrated from ‘Amr bin Shu’aib, from his father, from his grandfather, that the Prophet (ﷺ) said the Takbir seven times and five times in the ‘Eid prayer
Hadith No. 1278
Sunan Ibn Majah
Gradings:
Al-Albani:
Hasan Sahih
Muhammad Fouad Abd al-Baqi:
Hasan Sahih
Shuaib Al Arnaut:
Hasan Lighairihi
Zubair Ali Zai:
Isnaad Hasan