Musnad Ahmad Hadith 11198

It is narrated from Abu Saeed Khudri (may Allah be pleased with him) that on the day of the Battle of Khandaq, we did not get the opportunity to perform the prayer, to the extent that even after Maghrib some time had passed. Until that time, the method of Salat al-Khawf (prayer of fear) had not been revealed, which was revealed later. When our sufficiency in the matter of fighting was achieved—meaning Allah had said that Allah would suffice the Muslims in fighting, and Allah is Powerful and Mighty—then the Prophet (ﷺ) ordered Bilal (may Allah be pleased with him), and he gave the Iqamah for Zuhr. The Prophet (ﷺ) led the prayer as he would in normal times. Then he led the Asr prayer in the same way as he would at its time, and likewise, he led the Maghrib prayer as he would at its own time.