Ibn ‘Abbas reported God’s messenger as saying, “When a man has intercourse with his wife while she is menstruating, he must give half a dinar in alms.’
Tirmidhi, Abu Dawud, Nasa’i, Darimi and Ibn Majah transmitted it.
Zaid b. Aslam said that a man asked God’s messenger what was lawful for him in his wife when she was menstruating, and he replied,
“She should tie her waist-wrapper on her, then you can do what you like above it.”
Mu'adh b. Jabal said that he asked God’s messenger what was lawful for him in his wife when she was menstruating, and he replied,
“What is above the waist-wrapper, but to abstain from that is better.”
Razin transmitted it and Muhyi as-Sunna said that its insad is not strong.