(40) باب النَّهْىِ عَنْ رَفْعِ الْبَصَرِ، إِلَى السَّمَاءِ عِنْدَ الدُّعَاءِ فِي الصَّلاَةِ
It was narrated from Abu Hurairah that:
The Messenger of Allah (ﷺ) said: "People should certainly stop lifting their gaze to the sky when they supplicate during the prayer, or they will lose their eyesight."
Reference: Sunan an-Nasa'i 1276
In-book reference: Book 13, Hadith 98
English translation: Vol. 2, Book 13, Hadith 1277