Hadith 17:678
Waki’ narrated to us, from Fitr, from Abu Ishaq, from al-Harith, from Ali, who said: "Say 'Yarhamuk Allah' (may Allah have mercy on you) to the one who sneezes between you and him three times. If he exceeds that, then it is wind."
حدثنا وكيع عن فطر عن أبي إسحاق عن الحارث عن علي قال شمت العاطس ما بينك وبينه ثلاثا فإن زاد فهو ريح