"The Messenger of Allah said to the people when they moved on the evening of Arafat and the morning of Jam' (assembly at Al-Muzdalifah): 'You must have tranquility.' He was reining in his camel, and when he entered Mina, he came down to Muhassir and said: 'You have to pick up pebbles the size of date stones of fingertips with which to stone the Jamrat.' And he (Al-Fadl) said: 'And the Prophet gestured with his hand like a man throwing a pebble.'" (Using translation from Nasāʾī 3052)
عَنْ رَسُولِ اللهِ ﷺ أَنَّهُ قَالَ فِي عَشِيَّةِ عَرَفَةَ وَغَدَاةِ جَمْعٍ لِلنَّاسِ حِينَ دَفَعُوا عَلَيْكُمُ السَّكِينَةَ وَهُوَ كَافٌّ نَاقَتَهُ حَتَّى إِذَا دَخَلَ مِنًى حِينَ هَبَطَ مُحَسِّرًا قَالَ عَلَيْكُمْ بِحَصَى الْخَذْفِ الَّذِي يُرْمَى بِهِ الْجَمْرَةُ وَالنَّبِيُّ ﷺ يُشِيرُ بِيَدِهِ كَمَا يَخْذِفُ الْإِنْسَانُ