On the authority of his mother: I saw the Messenger of Allah ﷺ throwing pebbles at the jamrah from the botton of wadi (valley) while he was riding (on a camel). He was uttering the takbir (Allah is most great) with each pebble. A man behind him was shading him. I asked about the man. They (the people) said: He is al-Fadl b. al-'Abbas. The people crowded. The Prophet ﷺ said: 'O people, do not kill each other ; when you throw pebbled at the jamrah, throw small pebbles. (Using translation from Abū Dāʾūd 1966)
رَأَيْتُ النَّبِيَّ ﷺ يَرْمِي الْجَمْرَةَ مِنْ بَطْنِ الْوَادِي وَهُوَ رَاكِبٌ يُكَبِّرُ مَعَ كُلِّ حَصَاةٍ وَرَجُلٌ مِنْ خَلْفِهِ يَسْتُرُهُ فَسَأَلْتُ عَنِ الرَّجُلِ فَقَالُوا الْفَضْلُ بْنُ عَبَّاسٍ وَازْدَحَمَ النَّاسُ فَقَالَ النَّبِيُّ ﷺ يَا أَيُّهَا النَّاسُ لَا يَقْتُلْ بَعْضُكُمْ بَعْضًا وَإِذَا رَمَيْتُمُ الْجَمْرَةَ فَارْمُوا بِمِثْلِ حَصَى الْخَذْفِ