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.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:651-282b – Abiá Hurayrah
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السيوطي:٦٥١-٢٨٢b –

"عَنْ أَبِى هُرَيْرَةَ قَالَ: شَمِّتْ أَخَاكَ ثَلَاثًا، فَمَا زَادَ فَهوُ زُكَامٌ".  

[د] أبو داود [هب] البيهقى في شعب الإيمان

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Collected by Abū Dāwūd
abudawud:5034 – Musaddad > Yaḥyá > Ibn ʿAjlān > Saʿīd b. Abū Saʿīd > Abū Hurayrah

Respond three times to your brother when he sneezes, and if he sneezes more often, he has a cold in his head.  

أبو داود:٥٠٣٤ – حَدَّثَنَا مُسَدَّدٌ حَدَّثَنَا يَحْيَى عَنِ ابْنِ عَجْلاَنَ قَالَ حَدَّثَنِي سَعِيدُ بْنُ أَبِي سَعِيدٍ عَنْ أَبِي هُرَيْرَةَ قَالَ

شَمِّتْ أَخَاكَ ثَلاَثًا فَمَا زَادَ فَهُوَ زُكَامٌ