The Messenger of Allah addressed us in Mina, and Allah enabled us to hear hwat he said when we were in our encampments. The Prophet started to teach them their rituals until he reached the Himar (Stoning the pillars), and he said: look for pebbles the size of date stones or fingertips. And he told the Muhajirun to camp in front of the Masjid and the Ansar to camp behind the Masjid.  

خَطَبَنَا رَسُولُ اللَّهِ ﷺ بِمِنًى فَفَتَحَ اللَّهُ أَسْمَاعَنَا حَتَّى إِنْ كُنَّا لَنَسْمَعُ مَا يَقُولُ وَنَحْنُ فِي مَنَازِلِنَا فَطَفِقَ النَّبِيُّ ﷺ يُعَلِّمُهُمْ مَنَاسِكَهُمْ حَتَّى بَلَغَ الْجِمَارَ فَقَالَ بِحَصَى الْخَذْفِ وَأَمَرَ الْمُهَاجِرِينَ أَنْ يَنْزِلُوا فِي مُقَدَّمِ الْمَسْجِدِ وَأَمَرَ الأَنْصَارَ أَنْ يَنْزِلُوا فِي مُؤَخَّرِ الْمَسْجِدِ  

The Messenger of Allah ﷺ addressed us when we were at Mina. Our ears were open and we were listening to what he was saying, while we were in our dwellings. He began to teach them the rites of hajj till he reached the injunction of throwing pebbles at the Jamrahs (pillars at Mina). He put his forefingers in his ears and said: (Throw small pebbles. He then commanded the Emigrants (Muhajirun) to station themselves. They stationed themselves before the mosque. He then commanded the Helpers (Ansar) to encamp. They encamped behind the mosque. Thereafter the people encamped.  

خَطَبَنَا رَسُولُ اللَّهِ ﷺ وَنَحْنُ بِمِنًى فَفُتِحَتْ أَسْمَاعُنَا حَتَّى كُنَّا نَسْمَعُ مَا يَقُولُ وَنَحْنُ فِي مَنَازِلِنَا فَطَفِقَ يُعَلِّمُهُمْ مَنَاسِكَهُمْ حَتَّى بَلَغَ الْجِمَارَ فَوَضَعَ أُصْبُعَيْهِ السَّبَّابَتَيْنِ فِي أُذُنَيْهِ ثُمَّ قَالَ بِحَصَى الْخَذْفِ ثُمَّ أَمَرَ الْمُهَاجِرِينَ فَنَزَلُوا فِي مُقَدَّمِ الْمَسْجِدِ وَأَمَرَ الأَنْصَارَ فَنَزَلُوا مِنْ وَرَاءِ الْمَسْجِدِ ثُمَّ نَزَلَ النَّاسُ بَعْدَ ذَلِكَ