Sunan Abu Dawud - سنن أبي داود
11. The Rites of Hajj (Kitab Al-Manasik Wa'l-Hajj) - كتاب المناسك
23) Chapter: Performing The Ifrad Hajj
The aforesaid tradition has also been narrated by Abu al-Aswad through a different chain of narrators. This version adds he who raises his voice in talbiyah for `Umrah (and wearing Ihram for it) should put off Ihram after performing `Umrah.
23) باب فِي إِفْرَادِ الْحَجِّ
حَدَّثَنَا ابْنُ السَّرْحِ، أَخْبَرَنَا ابْنُ وَهْبٍ، أَخْبَرَنِي مَالِكٌ، عَنْ أَبِي الأَسْوَدِ، بِإِسْنَادِهِ مِثْلَهُ زَادَ فَأَمَّا مَنْ أَهَلَّ بِعُمْرَةٍ فَأَحَلَّ .
حكم: صحيح (الألباني)