The ruling on blood on clothing during prayer

Question:
The questioner asks: Is blood on clothing considered impure, such that it is not permissible to pray in it? And if one sees blood on his clothing during prayer, is it obligatory for him to break the prayer, even if the amount is small?

Answer:
Yes, blood is impure. If it affects the clothing or the body, it must be washed, just like other impurities. It must be washed like other impurities because prayer requires purity from ritual impurity, purity of the clothing, purity of the body, and purity of the place. These are among the conditions of prayer. If there is a large amount of blood on his clothing, it is not permissible to pray in it until this blood is washed.
When the Prophet (peace and blessings be upon him) was asked about menstrual blood that affects the clothing, he said: "Scrape it, then crush it, then sprinkle it with water, then pray in it." So he ordered the washing of menstrual blood from the clothing, and then praying in it afterward. This indicates that blood is impure. It was reported in a hadith that the Prophet (peace and blessings be upon him) his sandals. On one occasion, he took off his sandals during prayer, so the Companions took off their sandals. When the Prophet (peace and blessings be upon him) finished the prayer, he asked them why they had taken them off. They said: "We saw you take them off, O Messenger of Allah." He said: "Jibril informed me that there is harm in them." He informed him that there was harm in his shoes. So he took them off during the prayer. It was reported that this harm was found to be blood; it was the blood of a flea or a louse, meaning the Messenger (peace and blessings be upon him) stepped on it and it burst under his sandal. This indicates that blood is impure, and that if it affects the clothing, it must be washed.
But if one prayed without knowing, and the prayer ended and he still did not know, his prayer is valid because he is excused due to ignorance. Or if he knew but forgot, and prayed and did not realize until after he had prayed, the correct view is that his prayer is valid. But if he knows during the prayer that there is impurity on his clothing, such as blood or urine or something else, if he has other clothes he can take off that garment and remain with clothes that cover him, he should take off that garment and continue the prayer. This is as if the impurity were on his headscarf or his cloak, or if he has two garments, he takes off the one with the impurity and leaves the rest to cover his private parts. He completes the prayer, and there is no harm. As for if he has only this clothing, and if he takes it off his private parts would be exposed, he exits the prayer. He exits the prayer, washes the impurity, then resumes the prayer from the beginning. He starts it anew because he entered it without purity. Yes.