Surah Al-Anfal — Ayah 9 (8:9)
إِذۡ تَسۡتَغِيثُونَ رَبَّكُمۡ فَٱسۡتَجَابَ لَكُمۡ أَنِّي مُمِدُّكُم بِأَلۡفٖ مِّنَ ٱلۡمَلَٰٓئِكَةِ مُرۡدِفِينَ ٩
English translation (Saheeh International)
[Remember] when you were asking help of your Lord, and He answered you, "Indeed, I will reinforce you with a thousand from the angels, following one another."
Brief commentary
Remember the day of Badr, when the Muslims asked for help from Allah for victory over their enemies, and Allah responded to them, reinforcing and helping them with a thousand angels, following one after another.