Sayyiduna Abdullah bin Abbas (may Allah be pleased with them) narrates: The Noble Prophet (peace and blessings be upon him) used to supplicate at the time of breaking the fast: "O Allah! We have fasted for You and with the sustenance provided by You we have broken our fast, so accept it from us. Indeed, You are the All-Hearing, the All-Knowing."
Hadith Referenceسنن الدارقطني / كتاب الصيام / 2280