Q: What is the shar'ee ruling regarding the last time one is allowed to eat sehri? Are you supposed to stop as soon as the time finishes or can you finish the food you were eating during or after the Azaan?
A: Sehri time ends with subh-e-saadiq. Once subh-e-saadiq sets in, it is not permissible for one to eat or drink anything. If the Fajr azaan was called out a while after subh-e-saadiq had entered, and one continued eating after subh-e-saadiq had entered, then the fast of that day will not be vaild. One will have to keep qadha for that day.
And Allah Ta'ala (الله تعالى) knows best.
أُحِلَّ لَكُمْ لَيْلَةَ الصِّيَامِ الرَّفَثُ إِلَى نِسَائِكُمْ هُنَّ لِبَاسٌ لَّكُمْ وَأَنتُمْ لِبَاسٌ لَّهُنَّ عَلِمَ اللَّـهُ أَنَّكُمْ كُنتُمْ تَخْتَانُونَ أَنفُسَكُمْ فَتَابَ عَلَيْكُمْ وَعَفَا عَنكُمْ فَالْآنَ بَاشِرُوهُنَّ وَابْتَغُوا مَا كَتَبَ اللَّـهُ لَكُمْ وَكُلُوا وَاشْرَبُوا حَتَّى يَتَبَيَّنَ لَكُمُ الْخَيْطُ الْأَبْيَضُ مِنَ الْخَيْطِ الْأَسْوَدِ مِنَ الْفَجْرِ ثُمَّ أَتِمُّوا الصِّيَامَ إِلَى اللَّيْلِ وَلَا تُبَاشِرُوهُنَّ وَأَنتُمْ عَاكِفُونَ فِي الْمَسَاجِدِ تِلْكَ حُدُودُ اللَّـهِ فَلَا تَقْرَبُوهَا كَذَلِكَ يُبَيِّنُ اللَّـهُ آيَاتِهِ لِلنَّاسِ لَعَلَّهُمْ يَتَّقُونَ ﴿البقرة: ١٨٧﴾
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