Al-Adab Al-Mufrad #934

Abu Hurayra said, "Two men sat in the presence of the Prophet may Allah bless him and grant him peace, and one of them was from a noble family than the other. The nobler of the two sneezed and did not praise Allah, so the Prophet did not ask for mercy for him. Then the other man sneezed and praised Allah, so the Prophet, may Allah bless him and grant him peace, asked for mercy on him. The noble man said, 'I sneezed in your presence and you did not ask for mercy for me. This other than sneezed and you asked for mercy on him.' The Prophet said, 'This man mentioned Allah, so I mentioned him. You forgot Allah, so I forgot you.'"