The Prophet of Allah (ﷺ) used to say when he broke his fast: O Allah, for Thee I have fasted, and with Thy provision I have broken my fast.
Sunan Abi Dawud Book 14, Hadith 46
← Previous Hadith I saw Ibn Umar holding his beard with his hand and cutting what exceeded the handful of it. He (Ibn Umar) said that the Prophet (ﷺ) said when he broke his fast: Thirst has gone, the arteries are moist, and the reward is sure, if Allah wills.

Sunan Abi Dawud Book 14, Hadith 45 Next Hadith → We broke the fast one during Ramadan when it was cloudy in the lifetime of the Messenger of Allah (ﷺ) ; then the sun rose. Abu Usamah said: I said to Hisham: Were they commanded to atone for it ? He replied: That was inevitable.

Sunan Abi Dawud Book 14, Hadith 47