لَمْ يَسْتَمِعْ — لَنْ يَسْتَمِعَ
Lam marks jussive and past negation. Lan marks subjunctive and future negation. Do not conflate the two.
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Lam versus Lan
The Jussive Imperfect: Governors, Conditions, and Request Responses
لَمْ يَسْتَمِعْ — لَنْ يَسْتَمِعَ
Lam marks jussive and past negation. Lan marks subjunctive and future negation. Do not conflate the two.