حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ عُمَرَ بْنَ الْخَطَّابِ، وَعَلِيَّ بْنَ أَبِي طَالِبٍ، وَأَبَا، هُرَيْرَةَ سُئِلُوا عَنْ رَجُلٍ، أَصَابَ أَهْلَهُ وَهُوَ مُحْرِمٌ بِالْحَجِّ فَقَالُوا يَنْفُذَانِ يَمْضِيَانِ لِوَجْهِهِمَا حَتَّى يَقْضِيَا حَجَّهُمَا ثُمَّ عَلَيْهِمَا حَجُّ قَابِلٍ وَالْهَدْىُ ‏.‏ قَالَ وَقَالَ عَلِيُّ بْنُ أَبِي طَالِبٍ وَإِذَا أَهَلاَّ بِالْحَجِّ مِنْ عَامٍ قَابِلٍ تَفَرَّقَا حَتَّى يَقْضِيَا حَجَّهُمَا ‏.‏

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." Translation Not Available

Book Ref: Muwatta Imam Malik Book 20 Hadith 862
Web Ref:  Muwatta Imam Malik Book 20 Hadith 160