Ibrahim says regarding someone who sneezes during prayer, that he should say "Alhamdulillah."

Hasan states regarding a person who sneezes during obligatory or non-obligatory prayer that he should say "Alhamdulillah."

Hazrat Muawiyah bin Hakam Sulami narrates that I was praying with the Prophet (peace and blessings be upon him) when a man sneezed during the prayer, and I said to him, "Yarhamuk Allah" (may Allah have mercy on you). The people started staring at me. I said, "May my mother lose me! Why are you looking at me?" The people began striking their hands on their thighs. When I realized that the people were trying to make me silent, I became silent. Then the Prophet (peace and blessings be upon him) completed the prayer. May my parents be sacrificed for you, I have never seen a better teacher than you before or after; you neither scolded me, nor spoke harshly to me, nor hit me. Then he said, "These prayers do not contain anything of people's speech; prayer is only for glorification, magnification, and recitation."

Hazrat Ghalib Abu Huzail narrates that Ibrahim was asked: If a person sneezes during prayer and someone else says to him "Yarhamuk Allah" (may Allah have mercy on you), what is the ruling regarding this? Ibrahim replied: He has said a good word; repetition (of the prayer) is not obligatory upon him.

Ibrahim says that if a person sneezes during prayer and someone else says to him "Yarhamukallah," then he will have to repeat the prayer.

Hazrat Abdul Hameed bin Jubair bin Shaibah narrates that I asked Hazrat Saeed bin Musayyib: If a person performs tayammum and offers prayer, and then during the time of prayer he finds water, what should he do? He replied that he should offer the prayer again.

Hasan and Muhammad say that if a person performs tayammum and offers prayer, and then finds water within the time of that prayer, he should repeat the prayer.

Hazrat Qasim says that if a person performs tayammum and offers prayer, and then finds water during the time of prayer, he should offer the prayer again.

Hazrat Sha'bi says that if a person performs tayammum and offers prayer, and then finds water during the time of that prayer, he should offer the prayer again.

Hazrat Tawus says that if a person performs tayammum and offers prayer, and then finds water within the time of that prayer, he should offer the prayer again.