When the sneezer (Yarhamukallah) said, he replied -
يَهْدِيْكُمُ اللَّهُ وَيُصْلِحُ بَالَكُمْ
Pronunciation
Yahdeekum-ullaahu wa yuslihu baalakum
Meaning
May Allah guide you and set your affairs in order. Special instructions have been given in the hadith to answer the sneeze dua like answering the salutation. These Sunnahs are neglected in our society.
Source: Sahih. Tirmidhi: 2741
Read the hadith
حَدَّثَنَا مَحْمُودُ بْنُ غَيْلاَنَ، حَدَّثَنَا أَبُو دَاوُدَ، أَخْبَرَنَا شُعْبَةُ، أَخْبَرَنِي ابْنُ أَبِي لَيْلَى، عَنْ أَخِيهِ، عِيسَى بْنِ عَبْدِ الرَّحْمَنِ عَنْ عَبْدِ الرَّحْمَنِ بْنِ أَبِي لَيْلَى، عَنْ أَبِي أَيُّوبَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " إِذَا عَطَسَ أَحَدُكُمْ فَلْيَقُلِ الْحَمْدُ لِلَّهِ عَلَى كُلِّ حَالٍ وَلْيَقُلِ الَّذِي يَرُدُّ عَلَيْهِ يَرْحَمُكَ اللَّهُ وَلْيَقُلْ هُوَ يَهْدِيكُمُ اللَّهُ وَيُصْلِحُ بَالَكُمْ " .
Narrated Abu Ayyub: that the Messenger of Allah (ﷺ) said: "When one of you sneezes let him say: 'Al-Hamdulillahi 'Ala Kulli Hal (All praise is due to Allah in every circumstance).' And let the one replying to him say: "Yarhamukallah (May Allah have mercy upon you).' And let him say to him: 'Yahdikumullah Wa Yuslihu Balakum (May Allah guide you and rectify your affairs).'" [Sahih (Albani). Tirmidhi: 2741]
Duas from IslamicAPI's Masnun Dua dataset (based on the Quran, hadith, Hisnul Muslim and Rahe Belayat). See the dataset