Ibn Ishaq محمد بن إسحاق بن يسار‎ · The Book of the Fear Prayer

"We were with Sa'eed bin Al-'Asi in Tabaristan, and Hudhaifah bin Al-Yaman was with us. He said: 'Which of you offered the fear prayer with the Messenger of Allah (ﷺ)?' Hudhaifah said: 'I did.' So Hudhaifah stood 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…