On the day of Al-Khandaq (the battle of Trench.) 'Umar bin Al-came cursing the disbelievers of Quraish after the sun had set and said, "O Allâh's Messenger (ﷺ) I could not offer the ' prayer till the sun had set." The Prophet (ﷺ) said, "By Allâh ! I, too, have not offered the Salât (prayed)." So we turned towards Buthân, and the Prophet (ﷺ) performed ablution and we too performed ablution and offered the ' prayer after the sun had set, and then he offered the Maghrib prayer. [1:570-O.B.]