What type of expression is qul in qul huwa Allāhu aḥad?

Supplementary Practice 23: Comparative Rhetorical Study of Sūrat al-Masad and al-Ikhlāṣ

• A negative particle making huwa jussive
• An active participle and predicate of huwa
• An imperative to proclaim, followed by declarative content
• A passive past verb