Maimuna said that some people passed the Prophet (ﷺ) dragging a sheep of theirs as big as an ass. Allah's Messenger ﷺ asked them why they did not make use of its skin, and when they told him that it had died a natural death he said, “Water and leaves of the mimosa flava* purify it." *The Arabic word is qaraz. meaning the leaves of the mimosa flave (salam) These were used for tanning. Ahmad and Abu Dawud transmitted it.