"And it is not appropriate for them" to bring it down; meaning: they are not able to do that.
﴿وَمَا يَنْبَغِي لَهُم﴾ أَنْ يَنْزِلُوا بِهِ؛ أَيْ: لَا يَسْتَطِيعُونَ ذَلِك.
