Question: 

I woke up late from sleep, and then I went to the refrigerator and eat a morsel of food and drank some water. I went out after that in order to ascertain the time and heard the Fajr Adhaan; so I withheld from (eating) and completed the (day’s) fasting. What is the ruling on this fasting of mine?

Answer:

The initiate affair (with regards to this is that the fasting) is correct Inshaa-Allaah. Your fasting is correct as long as it is not ascertained that your eating was after fajr. The initial affair (with regards to this is that the fasting) is correct and it is not obligatory upon you to repeat (the fast); because the scholars say: ”Whoever eats whilst being doubtful about the approach of the fajr, his fasting is correct.” [Al-Fataawaa Wad-Duroos Fil-Masjidil Haraam of Shaikh Abdullaah Bin Muhammad Bin Humaid (rahimahullaah) page: 507]