«لَا تَعْبُدُونَ إِلَّا اللَّهَ»
You shall not worship anyone except Allah.
Taʿbudūna retains its indicative nūn; it is not the jussive form that would follow the prohibitive lā al-nāhiyah. The surface is therefore declarative. Yet the covenant makes it perform the force of a prohibition and binding instruction.
Recognizing both levels preserves the grammar while explaining the rhetorical function.