Allah, Exalted be His praise, says: "And do not approach them until they become pure. Then when they have purified themselves, come to them from where Allah has commanded you." [Surah al-Baqarah: 222]
And Imam al-Shafi'i (may Allah have mercy on him) said: "It has been said, and Allah knows best, that (yathurna means) they become pure from menstruation, and when they have purified themselves with water."
Sayyiduna Ibn Abbas (may Allah be pleased with them both) said regarding the saying of Allah Almighty, "So keep away from women during menstruation" [Surah al-Baqarah: 222]: Keep away from intercourse with their private parts. And regarding "And do not approach them until they become pure" [Surah al-Baqarah: 222], he said: When they have become pure from the blood and have thoroughly purified themselves with water. Then regarding "Then come to them from where Allah has commanded you" [Surah al-Baqarah: 222], he said: In the private part, and do not go beyond it to anything else; whoever does anything (other than that) has transgressed the limit.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحيض / 1481
Mujahid (may Allah have mercy on him) said regarding the saying of Allah Almighty, "And do not approach them until they become pure" [Surah al-Baqarah: 222]: Until the blood stops. And regarding "Then when they have purified themselves" [Surah al-Baqarah: 222], he said: When they have taken a ritual bath.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحيض / 1482
Al-Hasan (may Allah have mercy on him) said regarding the menstruating woman, when she becomes pure from the blood: Her husband should not come to her until she has taken a ritual bath.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحيض / 1483
Hadith Gradingمحدثین:حسن لغيرهٖ
Hadith Takhrij«حسن لغيرهٖ۔ أخرجه ابن أبي شيبة 1029»
Salim (may Allah have mercy on him) heard al-Hasan (may Allah have mercy on him) say: There is no harm if the husband covers his wife (that is, has intercourse with her) while no water is available, they are on a journey, and the woman has become pure from menstruation, when she has only performed dry ablution (tayammum).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحيض / 1484
It is reported from Salim and Sulayman bin Yasar (may Allah have mercy on them both) that they were both asked about the menstruating woman: May her husband have intercourse with her when she sees the purity, before she takes a ritual bath? They said: No, not until she takes a ritual bath.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحيض / 1485
It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that a Bedouin came to the Prophet (peace and blessings be upon him) and said: O Messenger of Allah, we stay in sandy terrain for four or five months, and among us there are women in postnatal bleeding, menstruating women and people in a state of major impurity. What do you say about them? He (peace and blessings be upon him) said: "Hold fast to the soil (that is, perform dry ablution, tayammum)."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحيض / 1486