The Messenger of Allah ﷺ stood up to pray and the people stood with him. He said the takbir and they said it as well. Then he bowed, and a group of them bowed with him. Then he prostrated and they prostrated with him.When he rose for the second rakah, those who had prostrated with him stepped back to stand guard over their brothers, while the other group came forward and bowed and prostrated with the Prophet ﷺ. All the people were engaged in the prayer and saying the takbir, but they were guarding one another.
أخبرني عمرو بن عثمان بن سعيد بن كثير عن محمد عن الزبيدي عن الزهري عن عبيد الله بن عبد الله بن عتبة أن
قام رسول الله ﷺ وقام الناس معه فكبر وكبروا ثم ركع وركع أناس منهم ثم سجد وسجدوا ثم قام إلى الركعة الثانية فتأخر الذين سجدوا معه وحرسوا إخوانهم وأتت الطائفة الأخرى فركعوا مع النبي ﷺ وسجدوا والناس كلهم في صلاة يكبرون ولكن يحرس بعضهم بعضا