Al-Adab Al-Mufrad, Book 44, Hadith 1114 (English) ⓘ
Abu Musa said, "The Jews used to sneeze in the presence in the Prophet, may Allah bless him and grant him peace, hoping that he would say to them, 'May Allah have mercy on you,' but he used to say, 'May Allah guide you and out your affairs in order.'"
وَعَنْ حَكِيمِ بْنِ دَيْلَمٍ، عَنْ أَبِي بُرْدَةَ، عَنْ أَبِي مُوسَى قَالَ: كَانَ الْيَهُودُ يَتَعَاطَسُونَ عِنْدَ النَّبِيِّ صلى الله عليه وسلم رَجَاءَ أَنْ يَقُولَ لَهُمْ: يَرْحَمُكُمُ اللَّهُ، فَكَانَ يَقُولُ: يَهْدِيكُمُ اللَّهُ وَيُصْلِحُ بَالَكُمْ.
also referenced under: Hadith 1114 (Reference) & Book 44, Hadith 14 (In-Book)