Narrated Salim bin 'Ubaid:

that he was with some people on a journey, and a man among the people sneezed and he said: "As-Salamu Alaikum (peace be upon you)." So he (Salim) said: "'Alaika Wa 'Ala Ummik (upon you and upon your mother)." It seemed as if that bothered the man, so he said: "Indeed I have not said except what the Prophet ﷺ said; a man sneezed in the presence of the Prophet ﷺ and said: 'As-Salamu 'Alaikum (peace be upon you)' so the Prophet ﷺ said: ''Alaika Wa 'Ala Ummik (upon you and upon your mother). When one of you sneezes let him say: "Al-Hamdulillahi Rabbil-'Alamin (All praise is due to the Lord of all that exists)" and let the one responding to him say: Yarhamukallah (May Allah have mercy upon you)" and let him reply: Yaghfirullah Li Walakum (May Allah forgive me and you both)."

حَدَّثَنَا مَحْمُودُ بْنُ غَيْلاَنَ، حَدَّثَنَا أَبُو أَحْمَدَ الزُّبَيْرِيُّ، حَدَّثَنَا سُفْيَانُ، عَنْ مَنْصُورٍ، عَنْ هِلاَلِ بْنِ يِسَافٍ، عَنْ سَالِمِ بْنِ عُبَيْدٍ، أَنَّهُ كَانَ مَعَ الْقَوْمِ فِي سَفَرٍ فَعَطَسَ رَجُلٌ مِنَ الْقَوْمِ فَقَالَ السَّلاَمُ عَلَيْكُمْ . فَقَالَ عَلَيْكَ وَعَلَى أُمِّكَ فَكَأَنَّ الرَّجُلَ وَجِدَ فِي نَفْسِهِ فَقَالَ أَمَا إِنِّي لَمْ أَقُلْ إِلاَّ مَا قَالَ النَّبِيُّ ﷺ عَطَسَ رَجُلٌ عِنْدَ النَّبِيِّ ﷺ فَقَالَ السَّلاَمُ عَلَيْكُمْ . فَقَالَ النَّبِيُّ ﷺ " عَلَيْكَ وَعَلَى أُمِّكَ إِذَا عَطَسَ أَحَدُكُمْ فَلْيَقُلِ الْحَمْدُ لِلَّهِ رَبِّ الْعَالَمِينَ وَلْيَقُلْ لَهُ مَنْ يَرُدُّ عَلَيْهِ يَرْحَمُكَ اللَّهُ وَلْيَقُلْ يَغْفِرُ اللَّهُ لَنَا وَلَكُمْ " .

قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ اخْتَلَفُوا فِي رِوَايَتِهِ عَنْ مَنْصُورٍ وَقَدْ أَدْخَلُوا بَيْنَ هِلاَلِ بْنِ يِسَافٍ وَسَالِمٍ رَجُلاً .