Reliance on Allah rather than miraculous intervention

۞ وَمَآ أَنزَلْنَا عَلَىٰ قَوْمِهِۦ مِنۢ بَعْدِهِۦ مِن جُندٍ مِّنَ ٱلسَّمَآءِ وَمَا كُنَّا مُنزِلِينَ

And We did not send down upon his people after him any soldiers from the heaven, nor would We have done so.