Al-Adab Al-Mufrad #943

Abu Burda said, "I came to Abu Musa while he was in the house of Umm al-Fadl ibn al-'Abbas and I sneezed and Abu Musa did not wish mercy on me. Umm al-Fadl sneezed and he wished mercy on her. I told my mother, so when Abu Musa came to her, she confronted him and said, 'My son sneezed and you did not wish mercy on him. She (Umm al-Fadl) sneezed and you wished mercy on her.' Abu Musa replied, 'I heard the Prophet, may Allah bless him and grant him peace, say, "When one of you sneezes and praises Allah, you should wish mercy on him, if he does not praise Allah, do not wish mercy on him." My son sneezed and did not praise Allah, so I did not wish mercy on him. She sneezed and praised Allah, so I wished mercy on her.' She said, 'You did well.'"