Muwatta Malik 124
موطأ مالك#124SahihYahya related to me from Malik from Zayd ibn Aslam that a man questioned the Messenger of Allah, may Allah bless him and grant him peace, saying, "What is permitted me from my wife when she is menstruating?" The Messenger of Allah, may Allah bless him and grant him peace, said, "Let her wrap her waist-wrapper round herself tightly, and then what is above that is your concern
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Salim al-HilaliSahih Lighairihi
In-book reference: 2:93