To analyze object ellipsis, ask three questions. First, does the speaker actually intend a specific relevant object, or is this mere nonmention? Second, what establishes the unspoken content: a conditional result, an earlier pronoun, a subsequent prepositional phrase, or the discourse setting? Third, what rhetorical advantage results?
ExampleIndicatorPrincipal effect
لو شاء لهداكمConsequence «لهداكم»Economy with a known object
ما ودعك ربك وما قلىEarlier «ك»Cadence and concision
رب أرني أنظر إليكLater «إليك»A specific intended object
والله يدعو إلى دار السلامGeneral invitation contextPossible breadth and economy
This procedure turns the claim of ellipsis into an evidence-based explanation rather than an assumption.