عَن أَنَسِ بْنِ مَالِكٍ رضي الله عنه قَالَ: قَالَ النَّبِيُّ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ: «مَا بَالُ أَقْوَامٍ يَرْفَعُونَ أَبْصَارَهُمْ إِلَى السَّمَاءِ فِي صَلاَتِهِمْ»، فَاشْتَدَّ قَوْلُهُ فِي ذَلِكَ، حَتَّى قَالَ: «لَيَنْتَهُنَّ عَنْ ذَلِكَ أَوْ لَتُخْطَفَنَّ أَبْصَارُهُمْ».
The Prophet (may Allah's peace and blessings be upon him) warned those who raise their eyes to the sky during prayer, whether during supplication or other times. His rebuke became more severe, and he (may Allah's peace and blessings be upon him) threatened that those who do so might have their eyesight snatched away swiftly, to the point that they would not even realize it until they had lost the blessing of sight.
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