Abu Dawud Book 2, Hadith Number 1148.
Chapter : Not known.
Narated By Abdullah ibn Amr ibn al-‘As : The Prophet (PBUH) used to say on the day of the breaking of the fast seven takbirs in the first rak’ah and then recite the Qur’an, and utter the takbir (Allah is most great). Then he would stand, and utter the takbir four times. Thereafter he would recite the Qur’an and bow.