اللَّهُمَّ إِنِّي لَكَ صُمْتُ وَبِكَ آمَنْتُ وَعَلَيْكَ تَوَكَّلْتُ وَبِكَ فَطَرْتُ

Transliteration:

"Allahumma inni laka sumtu wa bika aamantu wa 'alayka tawakkaltu wa bika fatarhtu."

Translation:

"O Allah, I fasted for You, and I believe in You, and I place my trust in You, and with Your sustenance, I break my fast."