You should wait until the second athan that announces the break of dawn.

If I’ve an intention of fasting, do i have to stop eating or drinking when I hear the first athan of Fajr, or should I wait for the second one?

Fasting | March 30, 2014 2:08 pm
Previous

I’m making qada of ramadan fastings.i have a question. few minutes( 2 or 3 minutes) before maghrib time if see menses is my fastng broken?? should make up this fast again or it is valid??
Next

I was fasting as an expiation for breaking an oath. I woke up for fajr. After doing wudu, I realized that there is some more time left for Athaan. So I decided to take a short slumber as I was quite tired. But I woke up after sunrise. I prayed the fajr immediately after doing wudu again. Is my fasting for those days valid?