2. Al-Baqara (The Cow)

Surah: 2   Aya: 222

222. Wayas-aloonaka AAani almaheedi qul huwa athan faiAAtaziloo alnnisaa fee almaheedi wala taqraboohunna hatta yathurna fa-itha tatahharna fa/toohunna min haythu amarakumu Allahu inna Allaha yuhibbu alttawwabeena wayuhibbu almutatahhireena
  

  Translation

222. 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 have purified (from menses and have taken a bath). And when they have purified themselves, then go in unto them as Allâh has ordained for you (go in unto them in any manner as long as it is in their vagina). Truly, Allâh loves those who turn unto Him in repentance and loves those who purify themselves (by taking a bath and cleaning and washing thoroughly their private parts, bodies, for their prayers, etc.).