Hazrat Ali (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: When any one of you sneezes, he should say: Alhamdulillah, and those around him should respond: Yarhamuk Allah, and he should reply to them: Yahdikumullah wa yuslihu balakum.

Hazrat Abu Abdur Rahman narrates that Hazrat Abdullah bin Masood (may Allah be pleased with him) said: When any one of you sneezes, he should say: Alhamdulillah. And those who are with him should reply: Yarhamukallah. And it is appropriate that he responds to them by saying: Yaghfirullahu lana wa lakum.

Imam A'mash narrates that Ibrahim said: When any man among the companions of Abdullah bin Mas'ud (may Allah be pleased with him) sneezed, he would say: "Alhamdulillah." The people would respond: "Yarhamuna Allahu wa iyyak." And then that person would reply: "Yaghfirullahu lana wa lakum."

Hazrat Nafi’ narrates that when Hazrat Ibn Umar (may Allah be pleased with them) would say“Yarhamukallah”to someone who sneezed, the person would reply:“Yarhamuna Allahu wa iyyakum.”And when he himself sneezed and someone said“Yarhamukallah”to him as a supplication, he would say:“Yaghfirullahu lana wa lakum wa yarhamuna wa iyyakum.”

Ibrahim narrates that when Abdullah bin Mas'ud (may Allah be pleased with him) was supplicated for by saying "Yarhamukallah" after he sneezed, he would reply: "Yaghfirullahu lana wa lakum."

Hazrat A'mash says that Ibrahim said: When the Companions would supplicate for someone who sneezed, they would say: "May Allah forgive us and you."

Hazrat Harith narrates that Hazrat Ali (may Allah be pleased with him) said: When someone blesses the one who sneezes, he should say: "Yarhamukallah." And in reply, he should say: "Yahdikumullah wa yuslihu balakum."

Hazrat Abu Huraira narrates that the Noble Prophet, peace and blessings be upon him, said: When the one who sneezes responds, he should say: "Yahdikumullahu wa yuslihu balakum."

Hazrat Talha bin Yahya narrates that I heard Hazrat Urwah bin Zubair, Yahya, Hazrat Isa bin Abi Talha, and Hazrat Ibrahim bin Muhammad bin Talha all saying: When any of you sneezes, it should be said to him: "Yarhamukallah." And he should reply: "Yahdikumullah wa yuslihu balakum."