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.
Related hadith on this topic
Explanation & Benefits
Shaykh Dr. Abdur Rahman Freywai
Commentary:
Note:
(In the chain of narration, "Yazid bin Abdur Rahman Abu Khalid al-Dalani" used to make many mistakes, and "Umar bin Ishaq bin Abi Talhah" and his mother "Humaidah or Ubaidah"—both are unknown [majhool].)
Source: Sunan al-Tirmidhi – Majlis ‘Ilmi Dar al-Da‘wah, New Delhi Edition, Page: 2744