Yazid bin Zari' يزيد بن زريع · The Book of the Fear Prayer

The Messenger of Allah (ﷺ) prayed at Dhi Qarad and the people formed two rows behind him, one row behind him and one row facing the enemy. He led those who were behind him in praying one rak'ah, then they went and took the place of the others, and the others came and he led them in praying one rak'ah, and they did not make it up.

"The Messenger of Allah (ﷺ) offered the fear prayer. He stood and said the takbir, and a group of us prayed behind him while another group was facing the enemy. The Messenger of Allah (ﷺ) bowed once and prostrated twice with them, then they moved away but did not say the taslim. They went to face the enemy and lined up in their places, and the other group came and formed a row behind the Messenger of Allah (ﷺ), and…