«وَقُولُوا لِلنَّاسِ حُسْنًا»
And speak well to people.
Qūlū is unambiguously imperative, while the earlier lā taʿbudūna is outwardly declarative. Once the latter is understood functionally as lā taʿbudū, both clauses share the force of injunction.
Coordination does not mean that arbitrary declaratives and commands can be joined. The covenant supplies common directive meaning, while the syntactic details of omitted or understood governing elements require separate grammatical analysis.