Prohibition (النهي) is commonly formed with the prohibitive lā plus a jussive present verb, as in “lā tafʿal”—“Do not do it.” Its ordinary function is to seek restraint from an act. But context may give this form a different rhetorical purpose.
«لَا تَمْتَثِلْ أَمْرِي»
Do not obey my instruction.
In a suitable situation this could be an ironic warning rather than a genuine wish for disobedience. Prohibitive forms can express entreaty, longing or ironic censure.
The source also considers how a condition may be understood even when it is not pronounced. The crucial point is to keep the literal grammatical request separate from the intention governing it.