It is narrated from Sayyidah Aishah (may Allah be pleased with her) that a man sneezed in the presence of the Messenger of Allah (peace and blessings be upon him) and asked: O Messenger of Allah, what should I say (on such an occasion)? He (peace and blessings be upon him) said: "Say: 'Al-hamdu lillah' (All praise is for Allah)." Then the people present said: O Messenger of Allah, what should we say to him (in reply)? He (peace and blessings be upon him) said: "Say: 'Yarhamuk Allah' (May Allah have mercy on you)." The man then asked: What reply should I give them (in return)? He (peace and blessings be upon him) said: "Say: 'Yahdikumullahu wa yuslihu balakum' (May Allah guide you and set your affairs right)."
The narrator Muhammad bin Abi Ma'shar in the chain of this hadith is weak; however, the etiquette of sneezing and these words are established by other sahih blessed hadith.
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب الأدب / 2596
Hadith Gradingمحدثین:إسناده صحيح
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :إسناده صحيح. » «أخرجه مسند أحمد برقم: 23975، وأخرجه شرح معاني الآثار برقم: 7025، وأخرجه إتحاف الخيرة المهرة بزوائد المسانيد العشرة برقم: 5520»