Sunan at-Tirmidhi (Jami-al-Tirmidhi), Chapter: Salah (Prayers)

reported than on the day of the Trenches, Umar ibn al-Khattab(RA) reviled the disbelieving Quraysh and said, "0 Messenger of Allah (SAW) I could not offer the Salah of Asr till the sun was about to set." He said, "By Allah! I could not offer the Salah of Asr till the sun was about to set." He said, "By Allah! I too have not offered it." The narrator said that they then stopped at Bathan where the Prophet (SAW) made ablution and then they made ablution and he offered the Asr and then he offered the Maghrib. [Muslim 631, Bukhari 596]