Hadith: jo apni haayeza biwi ( yani haiz ki halat mein) se humbistari karey to wo ek dinar ya aadha dinar sadqa karey.

Bismillah-Hirrahman-Nirrahim

Abdullah bin Abbas Radi-Allahu-Anhu  se rivayat hai ki Rasoollallah Sallallhu-Alaihi-Wasallam  ne farmaya us shaksh ke baarey mein jo apni haayeza biwi ( yani haiz ki halat mein) se humbistari karey to wo ek dinar ya aadha dinar sadqa karey.
Sunan Nasaii, Vol 1, 292 ( Sahih)

Anas Radi-Allahu-Anhu  se rivayat hai ki Yahudiyon mein se jis waqt kisi khatun ko haiz aata to wo apney saath na usey khilatey aur na ek makan mein uskey saath rahtey, Sahaba Radi-Allahu-Anhuma ne iskey mutalliq pucha to  is par Allah Subhanahu ne ye aayat nazil farmayee jiska mafhum hai ki

Aur Aapsey Haiz ke baarey mein puchtey hain kah dijiye ki wo Najasat (Napaki) hai isliye Haiz mein aurton se dur raho aur unkey paas na jao ( yani humbistari na karo) yahan tak ki wo paak ho jayain phir jab wo paak ho jaye to unkey paas jao jahan se Allah ne tumhey hukm diya hai beshaq Allah Tauba karney walo ko Dost rakhta hai aur bahut paak rahney walon ko dost rakhta hai - Al Quran 2:222

Phir Aap Sallallahu-Alaihi-Wasallam ne Sahaba karam Radi-Allahu-Anhuma se farmaya ki wo Aurton se Haiz ki halat mein saath khilayein Peelayein aur ek makan mein saath rahain aur humbistari (intercourse) ke alawa tamam kaam karain.

Sunan Nasaii, Vol 1, 291 ( Sahih)

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It was narrated that Anas Radi-Allahu-Anhu  said: "When one of their womenfolk menstruated, the Jewswould not eat or drink with them, nor mix with them in their houses. They asked the Prophet of Allah  Peace be upon him  about that, and Allah Mighty and Sublime revealed

They ask you concerning menstruation. Say: that is an Adha (a harmful thing for a husband to have a sexual intercourse with his wife while she is having her menses), therefore keep away from women during menses and go not unto them till they are purified. And when they have purified themselves, then go in unto them as Allah has ordained for you Truly, Allah loves those who turn unto Him in repentance and loves those who purify themselves
Al Quran, 2 : 222 ) So the Messenger Allah commanded them to eat and drink with them (menstruatingwomen) and to mix with them in their houses, and to do everything

with them except intercourse.
Sunan Nasaii, Vol 1, 289 (Sahih)

It was narrated from Ibn Abbas from the Prophet  Peace be upon him Concerning a man who has had intercourse with his wife while she was menstruating: "Let him give a Dinar or half a Dinar in charity
Sunan Nasaii, Vol 1, 290  (Sahih)