Ubaydullah bin 'Abdullah bin 'Utba عبيد الله بن عبد الله بن عتبة بن مسعود · 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', and he described it. He said: 'The Messenger of Allah (ﷺ) offered the fear prayer, leading one group who had formed rows behind him in praying one rak'ah, while the other group was between him and the enemy. So he led the group that was near…