Hadith 8:1271
Abu Bakr narrated to us, he said: Abu Khalid al-Ahmar narrated to us, from Ibn Jurayj, from Abu al-Zubayr, from Abu Ma'bad, from Ibn Abbas, that the Messenger of Allah (may Allah bless him and grant him peace) said: "Throw the pebbles (at the Jamarat) with the size of the pebbles of al-khadhf (pebbles thrown by placing them between the two index fingers)."
حدثنا أبو بكر قال حدثنا أبو خالد الأحمر عن بن جريج عن أبي الزبير عن أبي معبد عن بن عباس ان رسول الله صلى الله عليه وسلم قال ارموا الجمار بمثل حصى الخذف