Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
suyuti:422-321bNāfiʿ
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السيوطي:٤٢٢-٣٢١b

"عَنْ نَافِعٍ أَنَّ ابْنَ عُمَرَ كَانَ إِذَا عَطَسَ فَقِيلَ لَهُ: يَرْحَمُكَ الله، قَالَ: يَرْحَمُنَا الله وَإِيَّاكُمْ، وَغَفَرَ لَنَا وَلَكُمْ".  

[هب] البيهقى في شعب الإيمان

See similar narrations below:

Collected by Mālik, Suyūṭī
malik:54-5Mālik > Nāfiʿ

Malik related to me from Nafi that when Abdullah ibn Umar sneezed and someone said to him, "May Allah have mercy on you," (Yarhamuka'llah), he said, "May Allah have mercy on us and you, and forgive us and you." (Yarhamuna'llah wa yaghfirlana wa lakum).  

مالك:٥٤-٥وَحَدَّثَنِي مَالِكٌ عَنْ نَافِعٍ

أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ كَانَ إِذَا عَطَسَ فَقِيلَ لَهُ يَرْحَمُكَ اللَّهُ قَالَ يَرْحَمُنَا اللَّهُ وَإِيَّاكُمْ وَيَغْفِرُ لَنَا وَلَكُمْ  

suyuti:430-300bIbn Masʿūd
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السيوطي:٤٣٠-٣٠٠b

"عَنِ ابْنِ مَسْعُودٍ قَالَ: إِذَا عَطَسَ الرَّجُلُ فَلْيَقُلْ: الْحَمْدُ للهِ رَبِّ العَالمينَ، ولْيَقُلْ: يَرْحمنا اللهُ وَإِيَّاكُمْ، يَغْفِرُ اللهُ لَنَا وَلكُمْ".  

ابن جرير