Umar said: The Messenger of Allaah (peace and blessings of Allaah be upon him) used to say when breaking his fast: “Dhahaba al-zama’ wa abtalat al-‘urooq wa thabata al-ajr in sha Allaah (Thirst is gone, the veins are moistened and the reward is certain if Allaah wills).”

Narrated by Abu Dawood, 2357; al-Daaraqutni, 25. Ibn Hajar said in al-Talkhees al-Habeer (2/202): al-Daaraqutni said, its isnaad is saheeh.

The du’aa’ “Allaahumma laka sumtu wa ‘ala rizqika aftartu (O Allaah, for You have I fasted and by Your provision I have broken my fast)” was narrated by Abu Dawood, 2358. It is a mursal hadeeth so it is da’eef (weak) . Al-Albaani classed it as da’eef in ben dawwad (510)