Sunan an-Nasa'i 792

Amr ibn Uthman ibn Sa‘id ibn Kathir narrated to us: Muhammad ibn Harb narrated to us from Az-Zubaydi, from Az-Zuhri; and Al-Walid narrated from Al-Awza‘i, from Az-Zuhri, from Abu Salamah, from Abu Hurayrah, who said: The iqamah was given and the people formed their rows. The Messenger of Allah ﷺ came out and, when he stood in his prayer place, remembered that he had not performed ghusl. He told the people, 'Stay where you are.' Then he returned to his house. He came back with water dripping from his head, having performed ghusl, while we remained standing in our rows.