It was
narrated from ‘Abdullah bin ‘Amr bin ‘As that the Messenger of
Allah (ﷺ) said:
“When the fasting person breaks his fast, his
supplication is not turned back.” (One of the narrators) Ibn Abi Mulaikah said: "When he broke his fast, I heard 'Abdullah bin
'Amr say: 'O Allah! I ask You by Your mercy, which encompasses all things, to forgive me.'"