It is narrated from Sayyiduna Hudhayfah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "When someone sneezes, respond to him (that is, say 'Yarhamuk Allah'), even if he is beyond seven seas; and whoever responds to one who sneezes, pleurisy (dhat al-janb, pain in the ribs), toothache and earache are removed from him."
No one narrated this hadith from Ibrahim bin Abi Ablah (may Allah have mercy on him) except Muhammad (may Allah have mercy on him).
Hadith Referenceالمعجم الأوسط / باب الألف / 696
Hadith Gradingمحدثین:إسناده ضعيف جدًّا، فيه محمد بن محصن العكاشي متروك
Hadith Takhrij«قال الهيثمي: وفيه محمد بن محصن العكاشي وهو متروك «مجمع الزوائد ومنبع الفوائد، ج 8، ص 58»»