Hadithcore
Sahih Muslim, 1217 b
sahih

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 ‏.‏

References2 variants
In-Book Reference
Book 15, Hadith 157
USC-MSA web (English) reference
Book 7, Hadith 2801 (deprecated numbering scheme)