Stoning the Jamarat and the size of the pebbles

It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that on the morning of Jamrat al-Aqabah the Messenger of Allah (peace and blessings be upon him) said to me: "Come, pick up for me some pebbles of the khadhf kind (small pebbles flicked between the fingers)." When the pebbles were placed in his blessed hand, he (peace and blessings be upon him) said: "Pebbles like these (are to be used), pebbles like these. And beware of extremism (going beyond bounds) in religion, for those before you were destroyed only because of extremism in religion."
This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it.

It is narrated from Sayyiduna Qudamah bin Abdullah bin Ammar al-Kilabi (may Allah be pleased with him) that: I saw the Messenger of Allah (peace and blessings be upon him) on the Day of Sacrifice (the 10th of Dhu al-Hijjah), riding a reddish-white she-camel, stoning the Jamrah; there was no beating, no one was being pushed away, and there was no cry of "Make way, make way."
This hadith is sahih (authentic) on the condition of Imam Bukhari, but the two Shaykhs did not record it.

It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "When Ibrahim (peace be upon him), the Khalil (intimate friend) of Allah, came to perform the rites of Hajj, Satan appeared before him at Jamrat al-Aqabah. He threw seven pebbles at him until he sank into the ground. Then he appeared before him at the second Jamrah, and he threw seven pebbles at him until he sank into the ground. Then he appeared before him at the third Jamrah, and he threw seven pebbles at him until he sank into the ground." Ibn Abbas (may Allah be pleased with them both) said: You stone Satan, and you follow the religion of your father (Ibrahim, peace be upon him).
This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it.