People should avoid lifting their eyes towards the sky while supplicating in prayer, otherwise their eyes would be snatched away. (Using translation from Muslim 429)
أَنَّ رَسُولَ اللهِ ﷺ قَالَ لَيَنْتَهِيَنَّ أَقْوَامٌ عَنْ رَفْعِهِمْ أَبْصَارَهُمْ عِنْدَ الدُّعَاءِ فِي الصَّلَاةِ إِلَى السَّمَاءِ أَوْ لَتُخْطَفَنَّ أَبْصَارُهُمْ