كتاب الحج
15  
The Book of Pilgrimage
(72)
Chapter: Validity of a child's hajj, and the reward of the one who takes him for Hajj
(72)
باب صِحَّةِ حَجِّ الصَّبِيِّ وَأَجْرِ مَنْ حَجَّ بِهِ ‏‏
Sahih Muslim 1336 d

A hadith like this has been narrated on the authority of Ibn 'Abbas through another chain of transmitters.

وَحَدَّثَنَا ابْنُ الْمُثَنَّى، حَدَّثَنَا عَبْدُ الرَّحْمَنِ، حَدَّثَنَا سُفْيَانُ، عَنْ مُحَمَّدِ بْنِ عُقْبَةَ، عَنْ كُرَيْبٍ، عَنِ ابْنِ عَبَّاسٍ، بِمِثْلِهِ ‏.‏
Reference : Sahih Muslim 1336d
In-book reference : Book 15, Hadith 460
USC-MSA web (English) reference : Book 7, Hadith 3094
  (deprecated numbering scheme)