"The time of waiting for Nifas during the time of AIlah's Messenger was forty days. We used to cover our faces with reddish-brown Wars."
Jami` at-Tirmidhi Book 1, Hadith 139
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Jami` at-Tirmidhi Book 1, Hadith 138 Next Hadith → "Allah's Messenger would go around to his women with one Ghusl."

Jami` at-Tirmidhi Book 1, Hadith 140