Yahya bin Sa'id (may Allah have mercy on him) heard Sa'id bin al-Musayyib (may Allah have mercy on him) say: What is your view about a man who has intercourse with his wife while in the state of ihram? The people gave no answer. Sa'id (may Allah have mercy on him) said: A man in ihram had intercourse with his wife, so he sent (someone) to Madinah to ask about it. Some people replied that they should be separated until the following year. Sa'id bin al-Musayyib (may Allah have mercy on him) said: They shall continue as they are, and they shall complete the Hajj which the two of them spoiled. Then when the Hajj becomes due upon them, Hajj and a sacrifice are due from them, and they should begin the talbiyah for Hajj from where they first began the talbiyah for the Hajj which they invalidated, and the two of them shall remain apart until they complete the Hajj.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9789