إِذاif كانَis نَصرُaid اللَهِof God وَقفاًreserved exclusively عَلَيكُمُfor you (plural)
إِذا كانَ نَصرُ اللَهِ وَقفاً عَلَيكُمُ
فَإِنَّthen indeed العِداthe foes التَنوينُnunation (a final -n sound) يَحذِفُهُremoves it الوَقفُthe pause
فَإِنَّ العِدا التَنوينُ يَحذِفُهُ الوَقفُ
If God's aid is reserved exclusively for you,
When God's help comes to you
then the foes are nunation, which a pause removes.
Your enemies' clamor is silenced in defeat
Sol 6.1