Hadith 5034
Narrated Abu Hurairah: Respond three times to your brother when he sneezes, and if he sneezes more often, he has a cold in his head.
Hadith 5035
The tradition mentioned above has also been transmitted by Abu Hurairah through a different chain from the prophet ﷺ. A transmitter Saeed bin Saeed said: I know him that he traced this tradition back to the prophet ﷺ. Abu Dawud said: Abu Nuaim transmitted it from Musa bin Qais, from Muhammad bin Ajlan, from Saeed, on the authority of Abu Hurairah, from the prophet ﷺ.
Hadith 5036
Narrated Ubayd ibn Rifaah az-Zuraqi: The Prophet ﷺ said: Invoke a blessing on one who sneezes three times; (and if he sneezes more often), then if you wish to invoke a blessing on him, you may invoke, and if you wish (to stop), then stop.
Hadith 5037
Salamah bin al-Akwa said: when a man sneezed beside the prophet ﷺ, he said to him: Allah have mercy on you, but when he sneezed again, he said: The man has a cold in the head.