An imperative meaning is not limited to a dedicated imperative verb. Classical Arabic recognizes four principal forms:
FormExampleGrammar
Imperative verbخُذْDirect command verb
Imperfect with lām of commandلِيُنْفِقْJussive imperfect with lām
Imperative verbal noun (ism fiʿl)حَيَّA noun functioning like a command
Verbal noun replacing a commandسَعْيًاMaṣdar standing for an omitted verb
They share a requestive meaning but differ in syntax, inflection and idiomatic use. Careful grammatical analysis improves the rhetorical interpretation.