فَلَا تُشْمِتْ بِيَ الْأَعْدَاءَ
So do not let the enemies rejoice over me. (al-Aʿrāf 7:150)
This is part of Hārūn’s address to Mūsā, peace be upon them. “Lā tushmit” has prohibitive grammar, but its force is not the assertion of authority. Hārūn pleads with his brother in a difficult situation.
Duʿāʾ here names the supplicatory or imploring force of the expression. The relationship between the speakers and the surrounding narrative reveal the plea.
Treating grammatical form as the whole meaning would mistake an appeal for an authoritative command.