افْتَحْ لِي بَابَ الْمَعْرِفَةِ.
Open the door of knowledge for me.
Here iftaḥ is grammatically imperative. Its actual force varies with the social relation: a humble address to someone with authority may be a plea, while between peers it may simply be a request.
Identifying the imperative form and identifying its rhetorical purpose are separate steps. Confusing them leads to faulty analysis of inshāʾ.