The Messenger of Allah (ﷺ) said: The people who lift their eyes towards the sky in Prayer should avoid it or they would lose their eyesight.
Sahih Muslim Book 4, Hadith 128
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Sahih Muslim Book 4, Hadith 127 Next Hadith → People should avoid lifting their eyes towards the sky while supplicating in prayer, otherwise their eyes would be snatched away.

Sahih Muslim Book 4, Hadith 129