Quran 3:125 — The Amramites (Ali-'Imran)

بَلىٰ ۚ إِن تَصبِروا وَتَتَّقوا وَيَأتوكُم مِن فَورِهِم هٰذا يُمدِدكُم رَبُّكُم بِخَمسَةِ ءالٰفٍ مِنَ المَلٰئِكَةِ مُسَوِّمينَ

Indeed, if you steadfastly persevere and maintain righteousness, then they attack you suddenly, your Lord will support you with five thousand* angels, well trained.

[3:124] You told the believers, "Is it not enough that your Lord supports you with three thousand angels, sent down?"

[3:126] GOD thus informs you, in order to give you good news, and to assure your hearts. Victory comes only from GOD, the Almighty, Most Wise.