Hasan says that when you see blood on your clothes, while you have already performed some part of the prayer, then remove the garment and continue praying.

Hazrat Sha’bah says that I asked Hazrat Hammad, if a person sees blood on his clothes during prayer, what should he do? He replied that he should remove the garment. I asked him, if he has only two garments, then what should he do? He replied that he should remove one garment and take the other from under his left armpit and place it over his right shoulder. I also asked Hazrat Hakam about this matter, and he also said the same.

Hazrat Aflah narrates that if Hazrat Qasim saw blood on his clothes, he would take them off.

Hazrat Abu Majliz says that if a person starts the prayer by saying the takbeer and does not see anything, then after starting the prayer he sees blood, he should complete the prayer.

Hazrat Abu Ja'far says that if you see blood on your clothes during prayer, then continue to pray.

Hazrat Hajim says that I asked Hazrat Abdullah bin Rabah, "If I see blood on my clothes, what should I do?" He replied, "Continue to perform the prayer, and when you have completed the prayer, then wash it off."

Hazrat Mujahid says that there is a concession for an old man that while standing up in prayer, he may move one of his feet forward.

Hazrat Ibn Abbas (may Allah be pleased with both of them) was asked: If a person, while standing up in prayer, puts one of his feet forward, what is the ruling on this? He considered it disliked and said that it is an accursed step.

The Prophet (peace and blessings be upon him) forbade covering the face during prayer.

Muhammad considered covering the face during prayer to be disliked.