I went in to see Abu Musa while he was in the house of the daughter of Fadl bin Abbas. I sneezed, and he did not invoke a blessing on me, then she sneezed, and he invoked a blessing on her. So I returned to my mother and told her what had happened.When he came to her, she said, "My son sneezed in your presence and you did not invoke a blessing on him, then she sneezed and you invoked a blessing on her."He replied, "Your son sneezed but did not praise Allah, so I did not invoke a blessing on him. She sneezed and praised Allah, so I invoked a blessing on her. I heard the Messenger of Allah ﷺ say, 'When one of you sneezes and praises Allah, invoke a blessing on him, but if he does not praise Allah, do not invoke a blessing on him.'"
دخلت على أبي موسى وهو في بيت بنت الفضل بن عباس، فعطست فلم يشمتني، وعطست فشمتها، فرجعت إلى أمي فأخبرتها، فلما جاءها قالت: عطس عندك ابني فلم تشمته، وعطست فشمتها، فقال: إن ابنك عطس، فلم يحمد الله، فلم أشمته، وعطست، فحمدت الله فشمتها، سمعت رسول الله ﷺ يقول: إذا عطس أحدكم فحمد الله، فشمتوه، فإن لم يحمد الله، فلا تشمتوه.