Abu Dawud said: this is a mursal tradition (i.e. the successor 'Ata directly reporting from the Prophet (ﷺ) and omitting the link of the Companions).
In-book : Book 2, Hadith 766
English translation : Book 3, Hadith 1151
2. Prayer (Kitab Al-Salat)
باب مَا يُقْرَأُ فِي الأَضْحَى وَالْفِطْرِ