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.
ibnmajah:3714ʿAlī b. Muḥammad > Wakīʿ > ʿIkrimah b. ʿAmmār > Iyās b. Salamah b. al-Akwaʿ from his father

"The Messenger of Allah ﷺ said: 'The one who sneezes may be responded to three times; if he sneezes more than that, he has a cold.'"  

ابن ماجة:٣٧١٤حَدَّثَنَا عَلِيُّ بْنُ مُحَمَّدٍ حَدَّثَنَا وَكِيعٌ عَنْ عِكْرِمَةَ بْنِ عَمَّارٍ عَنْ إِيَاسِ بْنِ سَلَمَةَ بْنِ الأَكْوَعِ عَنْ أَبِيهِ قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ يُشَمَّتُ الْعَاطِسُ ثَلاَثًا فَمَا زَادَ فَهُوَ مَزْكُومٌ  


See similar narrations below:

Collected by Abū Dāwūd, Suyūṭī
abudawud:5034Musaddad > 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:٥٠٣٤حَدَّثَنَا مُسَدَّدٌ حَدَّثَنَا يَحْيَى عَنِ ابْنِ عَجْلاَنَ قَالَ حَدَّثَنِي سَعِيدُ بْنُ أَبِي سَعِيدٍ عَنْ أَبِي هُرَيْرَةَ قَالَ

شَمِّتْ أَخَاكَ ثَلاَثًا فَمَا زَادَ فَهُوَ زُكَامٌ