Narrated Abu Musa:
The Jews used to sneeze in the presence of the Prophet (ﷺ) hoping that he would say: 'Yarhamukumullah (May Allah have mercy upon you).' So he said: 'Yahdikumullahu Wa Yuslihu Balakum (May Allah guide you and rectify your affairs).'" (JA)
English reference (JA): Vol. 5, Book 41, Hadith 2739 (JA)
Arabic reference (JA): Book 43, Hadith 2958 (JA)