The occasion of the hadith: “They killed him, may Allah kill them”

Question:
May Allah reward you and bless you. He asks: What is the occasion of the saying of the Messenger (peace and blessings be upon him), “They killed him, may Allah kill them”? Why did they not ask about what they did not know?

Answer:
The occasion is that a group of the Companions were on a journey or in a military expedition. One of them had a wound on his head caused by a stone that struck him. Then this man had a wet dream at night, and it became obligatory for him to perform the full ritual bath for major ritual impurity. He feared that if water touched the wound, it would harm him. So he asked his companions if he had an excuse to leave off the full ritual bath, given the wound he had?
They issued a ruling for him to perform the full ritual bath. The water touched his wound and he died. So the Prophet (peace and blessings be upon him), when he learned of this, said, “They killed him, may Allah kill them,” meaning because of their error and their issuing of a ruling. Then he said (peace and blessings be upon him)
The chain of narration of the hadith may not be free from what was mentioned, but it indicates that if a person with a wound or something else is affected by the water of ritual purity, he does not wash that place. He performs dry ablution with clean earth. He washes the sound parts of his body or limbs, and performs dry ablution for the wound. The water does not touch it. And if the wound has a bandage or a splint or something that covers it, he wipes over it, and that is sufficient.