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.
tirmidhi:2745Muḥammad b. And Zīr al-Wāsiṭī > Yaḥyá b. Saʿīd > Muḥammad b. ʿAjlān > Suma > Abū Ṣāliḥ > Abū Hurayrah

that when the Prophet ﷺ would sneeze, he would cover his face with his hand or with his garment, and muffle the sound with it.  

Abū ʿĪsá said that this Ḥadīth is Ḥasan-Ṣaḥīḥ.
الترمذي:٢٧٤٥حَدَّثَنَا مُحَمَّدُ بْنُ وَزِيرٍ الْوَاسِطِيُّ حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ عَنْ مُحَمَّدِ بْنِ عَجْلاَنَ عَنْ سُمَىٍّ عَنْ أَبِي صَالِحٍ عَنْ أَبِي هُرَيْرَةَ

أَنَّ النَّبِيَّ ﷺ كَانَ إِذَا عَطَسَ غَطَّى وَجْهَهُ بِيَدِهِ أَوْ بِثَوْبِهِ وَغَضَّ بِهَا صَوْتَهُ  

قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ

See similar narrations below:

Collected by Ḥākim
hakim:7796Abū ʿAbdullāh Muḥammad b. Yaʿqūb > Yaḥyá b. Muḥammad b. Yaḥyá > Musaddad > Yaḥyá b. Saʿīd > Ibn ʿAjlān > Sumay > Abū Ṣāliḥ > Abū Hurayrah

that when the Prophet ﷺ would sneeze, he would cover his face with his hand or with his garment, and muffle the sound with it. (Using translation from Tirmidhī 2745)  

الحاكم:٧٧٩٦أَخْبَرَنَا أَبُو عَبْدِ اللَّهِ مُحَمَّدُ بْنُ يَعْقُوبَ ثَنَا يَحْيَى بْنُ مُحَمَّدِ بْنِ يَحْيَى ثَنَا مُسَدَّدٌ ثَنَا يَحْيَى بْنُ سَعِيدٍ عَنِ ابْنِ عَجْلَانَ عَنْ سُمَيٍّ عَنْ أَبِي صَالِحٍ عَنْ أَبِي هُرَيْرَةَ

«أَنَّ النَّبِيَّ ﷺ كَانَ إِذَا عَطَسَ غَطَّى وَجْهَهُ بِيَدِهِ أَوْ بِثَوْبِهِ وَغَضَّ بِهَا صَوْتَهُ»  

هَذَا حَدِيثٌ صَحِيحُ الْإِسْنَادِ وَلَمْ يُخَرِّجَاهُ صحيح