Imam Bukhari narrates: Haiwah bin Shuraih narrated to us, he said: Muhammad bin Harb narrated to us from al-Zubaidi from al-Zuhri from Ubaidullah bin Abdullah bin Utbah from Ibn Abbas, may Allāh be pleased with them both, he said that

the Prophet ﷺ stood up, and the people stood up with him. He said the takbir, and the people said the takbir with him. He performed ruku, and some of the people performed ruku with him, then he prostrated, and those people prostrated with him, then he stood up for the second rak'ah, so those who had prostrated with him also stood up, and they protected their brothers, and the other group came, so they performed ruku with him and prostrated, and all the people were in the prayer but were also protecting one another.