سنن النسائي

It was narrated from 'Ubaidullah bin Abdullah bin Utbah that: 'Abdullah bin 'Abbas said: "The Messenger of Allah (ﷺ) stood and the people stood with him, and he said the takbir and they said the takbir. Then he bowed, and some of them bowed, then he prostrated and they prostrated, then he stood for the second rak'ah and those who had prostrated with him moved back and guarded their brothers, and the other group came and bowed and prostrated with the Prophet (ﷺ). All the people were praying and saying the takbir, but they were guarding one another."