Hadithcore
Sahih al-Bukhari, 2986
sahih

Narrated Anas:

I was riding behind Abu Talha (on the same) riding animal and (the Prophet's companions) were reciting Talbiya aloud for both Hajj and `Umra.

حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا عَبْدُ الْوَهَّابِ، حَدَّثَنَا أَيُّوبُ، عَنْ أَبِي قِلاَبَةَ، عَنْ أَنَسٍ ـ رضى الله عنه ـ قَالَ كُنْتُ رَدِيفَ أَبِي طَلْحَةَ، وَإِنَّهُمْ لَيَصْرُخُونَ بِهِمَا جَمِيعًا الْحَجِّ وَالْعُمْرَةِ‏.‏

References2 variants
In-Book Reference
Book 56, Hadith 195
USC-MSA web (English) reference
Vol. 4, Book 52, Hadith 229 (deprecated numbering scheme)