It is narrated from Sayyiduna Anas (may Allah be pleased with him) that Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) said: "When this verse was revealed: 'Soon this host will be defeated and will turn their backs (in flight)', I said: Which host is this? Then when the day of Badr came, I saw the Messenger of Allah (peace and blessings be upon him) with a drawn sword in his (peace and blessings be upon him) hand, and he (peace and blessings be upon him) was reciting this verse: 'Soon this host will be defeated and will turn their backs.'"
Imam al-Tabarani (may Allah have mercy on him) said: "Only Ma'mar (may Allah have mercy on him) narrated this hadith from Qatadah (may Allah have mercy on him), and only Abd al-Majid from Ma'mar, and Muhammad bin Isma'il al-Ansari is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب العين / 3829
Hadith Gradingمحدثین:فيه محمد بن إسماعيل بن علي الأنصاري لم يعرفه الهيثمي
Hadith Takhrij«قال الهيثمي: فيه محمد بن إسماعيل بن علي الأنصاري ولم أعرفه «مجمع الزوائد ومنبع الفوائد، ج 6، ص 78»» «أخرجه ابن حجر فى «المطالب العالية» برقم: 3735 / 2»