It wasnarrated from 'Amr bin Shu'aib, from his father, from hisgrandfather, that the Prophet (ﷺ) said the Takbir seven times andfive times in the 'Eid prayer. (RU)
English reference (RU): Vol. 1, Book 5, Hadith 1278 (RU)
Arabic reference (RU): Book 5, Hadith 1337 (RU)