«وَاغْضُضِ الطَّرْفَ تَسْتَرِحْ مِنْ غَرَامٍ تَكْتَسِي فِيهِ ثَوْبَ ذُلٍّ وَشَيْنٍ»
Lower your gaze and you will find relief from infatuation that clothes its victim in humiliation and disgrace.
Wa-ghḍuḍi al-ṭarfa is an imperative with its object. Tastariḥ is jussive as the answer to a request or command (jawāb al-ṭalab). Taktasī fīhi thawba dhullin continues the metaphor of wearing disgrace.
The construction means more than “do one thing and then another.” It promises relief as the consequence of obeying the imperative. “Lower your gaze and you will rest” captures that conditional relation.