﴿ إِذْ تَقُولُ لِلْمُؤْمِنِينَ أَلَن يَكْفِيَكُمْ أَن يُمِدَّكُمْ رَبُّكُم بِثَلَٰثَةِ ءَالَٰفٍۢ مِّنَ ٱلْمَلَٰٓئِكَةِ مُنزَلِينَ ﴾

“[And remember] when thou didst say unto the believers: "Is it not enough for you [to know] that your Sustainer will aid you with three thousand angels sent down [from on high]?”

When idh an adverbial qualifier of nasarakum ‘He gave you victory’ in the previous verse you were saying to the believers promising them as reassurance for them ‘Is it not sufficient for you that your Lord should reinforce you that He should succour you with three thousand angels sent down? read munzalīn or munazzalīn ‘sent down’.