وَمَا ذَرَفَتْ عَيْنَاكِ إِلَّا لِتَضْرِبِي
بِسَهْمَيْكِ فِي أَعْشَارِ قَلْبٍ مُقَتَّلِ
“Your two eyes shed tears only to strike, with your two arrows, the fragments of a heart that had already been wounded again and again.”
Mā ... illā establishes restriction or exclusivity. The poet presents a single purpose for the beloved’s tears, but this is an impassioned poetic accusation, not a factual investigation of the beloved’s intentions.
In bi-sahmayki, the two eyes or their glances become two arrows. Aʿshār qalbin muqattal presents a fragmented heart suffering new injury despite having already been wounded by love.