Yahya related to me from Malik that he had heard that Umar ibnal-Khattab and AIi ibn Abi Talib and Abu Hurayra were asked about aman who had intercourse with his wife while he was in ihram on hajj.They said, "The two of them should carry on and complete their hajj.Then they must do hajj again in another year, and sacrifice ananimal."Malik added that AIi ibn Abi Talib said, "When theythen go into ihram for hajj in a future year they should keep apartuntil they have completed their hajj."
USC-MSA web (English) reference: Book 20, Hadith 160
Arabic reference: Book 20, Hadith 862