The ruling on one who prayed while there was bird blood on his garment

Question:
The Shaykh: A questioner says: I prayed while there was blood from a bird on my garment. Do I have to repeat the prayer? And does the ruling differ between the blood of an animal and the blood of a human?

Answer:
If you prayed while forgetting the blood or the impurity, forgetting that there was blood on your garment or on your body, and you prayed and did not realize it until after you had finished, your prayer is valid, but you must wash it for the next prayer.