(92) باب رَفْعِ الْبَصَرِ إِلَى السَّمَاءِ فِي الصَّلاَةِ
Narrated Anas bin Malik:
The Prophet (ﷺ) said, "What is wrong with those people who look towards the sky during the prayer?" His talk grew stern while delivering this speech and he said, "They should stop (looking towards the sky during the prayer); otherwise their eyesight would be taken away."
Reference: Sahih al-Bukhari 750
In-book reference: Book 10, Hadith 144
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 12, Hadith 717