It is narrated from Sayyiduna Ali (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Whoever says the praise (of Allah) before the one who sneezes is protected from pain in the side, and he will never suffer pain in his molars."
Al-Tabarani recorded it in al-Mu'jam al-Awsat; its chain contains al-Harith al-A'war, whom the majority declared da'if (weak), though he was also declared trustworthy. Its chain also contains narrators whom I do not know.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الأدب / 12909
Hadith Gradingمحدثین:إسنادہ ضعیف
Hadith Takhrij«أخرجه المعجم الأوسط للطبراني برقم: 7137»