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.
Reference: Sunan Abi Dawud 5036 In-book : Book 43, Hadith 264 English translation : Book 42, Hadith 5018
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