(123) باب الْحَمْدِ لِلْعَاطِسِ
Narrated Anas bin Malik:
Two men sneezed before the Prophet. The Prophet (ﷺ) said to one of them, "May Allah bestow His Mercy on you," but he did not say that to the other. On being asked (why), the Prophet (ﷺ) said, "That one praised Allah (at the time of sneezing), while the other did not praise Allah."
Reference: Sahih al-Bukhari 6221
In-book reference: Book 78, Hadith 245
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 8, Book 73, Hadith 240