كتاب الحج
15  
The Book of Pilgrimage
(18)
Chapter: Tamattu with Hajj and Umrah
(18)
باب فِي الْمُتْعَةِ بِالْحَجِّ وَالْعُمْرَةِ ‏
Sahih Muslim 1217 b

Qatada narrated this hadith with the same chain of transmitters saying:

(That 'Umar also said): Separate your Hajj from 'Umra, for that is the most complete Hajj, and complete your Umra.
وَحَدَّثَنِيهِ زُهَيْرُ بْنُ حَرْبٍ، حَدَّثَنَا عَفَّانُ، حَدَّثَنَا هَمَّامٌ، حَدَّثَنَا قَتَادَةُ، بِهَذَا الإِسْنَادِ وَقَالَ فِي الْحَدِيثِ فَافْصِلُوا حَجَّكُمْ مِنْ عُمْرَتِكُمْ فَإِنَّهُ أَتَمُّ لِحَجِّكُمْ وَأَتَمُّ لِعُمْرَتِكُمْ ‏.‏
Reference : Sahih Muslim 1217b
In-book reference : Book 15, Hadith 157
USC-MSA web (English) reference : Book 7, Hadith 2801
  (deprecated numbering scheme)