Hadith 17:682
Yazid ibn Harun narrated to us, he said: Muhammad ibn Ishaq narrated to us, from Muhammad ibn Ja'far ibn al-Zubayr, that a man sneezed in the presence of the Prophet, may Allah bless him and grant him peace, so he said "Yarhamuk Allah" (may Allah have mercy on you) to him. Then he sneezed, so he said "Yarhamuk Allah" to him. Then he sneezed a fourth time, so the Prophet, may Allah bless him and grant him peace, said to him: "You are suffering from a cold, so blow your nose."
حدثنا يزيد بن هارون قال حدثنا محمد بن إسحاق عن محمد بن جعفر بن الزبير أن رجلا عطس عند النبي صلى الله عليه وسلم فشمته ثم عطس فشمته ثم عطس الرابعة فقال له النبي صلى الله عليه وسلم مضنوك فامتخطه