Sunan an-Nasa'i, Volume 3, Book 24, Hadith 3081 (DarusSalam) ⓘ

It was narrated from Ibn 'Abbas that his brother Al-Fadl bin 'Abbas said: "I was riding behind the Prophet and he continued to recite the Talbiyah until he stoned Jamratul'Aqabah. He stoned it with seven pebbles, saying the Takbir with each throw."

أَخْبَرَنَا هَارُونُ بْنُ إِسْحَاقَ الْهَمْدَانِيُّ الْكُوفِيُّ، قَالَ حَدَّثَنَا حَفْصٌ، عَنْ جَعْفَرِ بْنِ مُحَمَّدٍ، عَنْ أَبِيهِ، عَنْ عَلِيِّ بْنِ الْحُسَيْنِ، عَنِ ابْنِ عَبَّاسٍ، عَنْ أَخِيهِ الْفَضْلِ بْنِ عَبَّاسٍ، قَالَ كُنْتُ رِدْفَ النَّبِيِّ صلى الله عليه وسلم فَلَمْ يَزَلْ يُلَبِّي حَتَّى رَمَى جَمْرَةَ الْعَقَبَةِ فَرَمَاهَا بِسَبْعِ حَصَيَاتٍ يُكَبِّرُ مَعَ كُلِّ حَصَاةٍ ‏.‏