عن أبي موسى كانت اليهود تعاطس عند النبي صلى الله عليه وسلم رجاء أن يقول لها: يرحمكم الله  فكان يقول لهم يهديكم الله ويصلح بالكم 

It was narrated from Abu Burdah that his father said: “The Jews used to sneeze in the presence of the Prophet, hoping that he would say to them, ‘Yarhamuk-Allãh (May Allah have mercy on you),’ but he used to say:  ‘Yah-di-kumullãh, wa yus-lihu bãlakum’ (May Allah guide you and set your affairs straight).”

[Abu Dawud #5038 Tirmithi 2739 He said: Hasan Saheeh.]