(45) باب اسْتِحْبَابِ إِدَامَةِ الْحَاجِّ التَّلْبِيَةَ حَتَّى يَشْرَعَ فِي رَمْىِ جَمْرَةِ الْعَقَبَةِ يَوْمَ النَّحْرِ
Ibn Abbas (Allah be pleased with them) reported that Allah's Apostle (ﷺ) made al-Fadl sit behind him (on the camel back) from the place (where the two prayers) are combined (Muzdalifa). Ibn Abbas (Allah be pleased with them) also informed that Allah's Apostle (ﷺ) did not stop pronouncing Talbiya till he threw pebbles at Jamrat al-'Aqaba.
Reference: Sahih Muslim 1281 b
In-book reference: Book 15, Hadith 294
USC-MSA web (English) reference(deprecated numbering scheme): Book 7, Hadith 2932