Abu Dawood: Hadith 1958

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.