إِذۡ تَقُولُ لِلۡمُؤۡمِنِينَ أَلَن يَكۡفِيَكُمۡ أَن يُمِدَّكُمۡ رَبُّكُم بِثَلَٰثَةِ ءَالَٰفٖ مِّنَ ٱلۡمَلَٰٓئِكَةِ مُنزَلِينَ ١٢٤
[Remember] when you said to the believers, "Is it not sufficient for you that your Lord should reinforce you with three thousand angels sent down?
Translation: Saheeh International (English)
Each word's meaning and sound
Remember, O Prophet, when you roused the believers during the battle of Badr, reassuring them after they heard that reinforcements were on their way for the idolaters, by asking whether it was not enough for them that Allah should help them with three thousand angels sent down from Him to reinforce them in the battle.
Al-Mukhtasar in interpreting the Noble Quran