Wallāhi laʾaktubanna ad-darsa: wāw of oath, genitive Allah, oath-response lam, emphatically marked present verb and accusative object.
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Lam plus Nūn in an Oath
The Two Emphatic Nūns: Forms and Rules
Wallāhi laʾaktubanna ad-darsa: wāw of oath, genitive Allah, oath-response lam, emphatically marked present verb and accusative object.