وَوَجَدَكَ ضَالًّا فَهَدَىٰ
And He found you in need of guidance and guided you. (الضحى: 7)
وَوَجَدَكَ عَائِلًا فَأَغْنَىٰ
And He found you in need and enriched you. (الضحى: 8)
Both verses repeat the pattern wa-wajadaka ... fa-.... Wāw links another favor to the preceding sequence; fā connects each previously stated condition with the corresponding divine benefit. The result is a patterned relation between a circumstance and its relief, not a random list.
The word ḍāllan requires careful contextual exegesis and should not be pressed into an unsuitable theological claim. The rhetorical point needed here is the parallel construction: the recurrence of one grammatical frame makes the varied benefits memorable and interconnected.