Wallāhi is an intervening oath: wāw governs the genitive Allāhi. Aḥsanta is still the past verb associated with qad.
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Parsing the Oath Exception
Qad: Expectation, Confirmation and Contextual Meanings
Wallāhi is an intervening oath: wāw governs the genitive Allāhi. Aḥsanta is still the past verb associated with qad.