Abu Saeed Khudri reported,

We were detained on the day of the Trench until a long portion of the night had passed before we were relieved. That is the meaning of Allah's words, "And Allah spared the believers from fighting, and Allah is ever Powerful and Mighty" [Ahzab 33:25].He said, The Messenger of Allah ﷺ then called Bilal and ordered him, so he gave the iqamah and the Prophet prayed Dhuhr, performing it well just as he would pray it at its proper time. Then he gave the iqamah for Asr and prayed it likewise, then he gave the iqamah for Maghrib and prayed it likewise, then he gave the iqamah for Isha and prayed it likewise. This was before the verse on the prayer of fear was revealed.Hajjaj said, regarding the prayer of fear, "But if you fear, then pray on foot or riding" [Baqarah 2:239].

حدثنا يزيد وحجاج قالا أنا ابن أبي ذئب عن المقبري

عن عبد الرحمن بن أبي سعيد الخدري عن أبيه قال

حبسنا يوم الخندق حتى ذهب هوي من الليل حتى كفينا وذلك قول الله {وكفى الله المؤمنين القتال وكان الله قويا عزيزا} قال فدعا رسول الله ﷺ بلالا فأمره فأقام فصلى الظهر وأحسن كما كان يصليها في وقتها ثم أقام للعصر فصلاها كذلك ثم أقام المغرب فصلاها كذلك ثم أقام العشاء فصلاها كذلك وذلك قبل أن ينزل في صلاة الخوف قال حجاج في صلاة الخوف {فإن خفتم فرجالا أو ركبانا}