CHAPTER: How many times should one say ' May Allah have mercy on you' to one who sneezes?
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.
The tradition mentioned above has also been transmitted by Abu Hurairah through a different chain from the prophet صلی اللہ علیہ وسلم. A transmitter Saeed bin Saeed said: I know him that he traced this tradition back to the prophet صلی اللہ علیہ وسلم. 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 صلی اللہ علیہ وسلم.
Narrated Ubayd ibn Rifaah az-Zuraqi: The Prophet صلی اللہ علیہ وسلم 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.
Salamah bin al-Akwa said: when a man sneezed beside the prophet صلی اللہ علیہ وسلم, he said to him: Allah have mercy on you, but when he sneezed again, he said: The man has a cold in the head.