The Book of Characteristics · Hadith 367 (#Ḥadīth #2)
Chapter 96 | What is said to Whoever Sneezes Three Times
3-125 وفي حديث آخر: أنه إن زاد العاطس على ثلاث قيل له: "شفاك الله" لان ذلك من علة
3-125 In another tradition we read, “If one sneezes for more than three times they tell him, ‘May God heal you!’ since that is due to an illness.”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).