Waṣala al-ṭālibu simply reports an arrival. Qad waṣala al-ṭālibu emphasizes that the arrival has indeed occurred; both verbs remain past.
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Past Without and With Qad
Qad: Expectation, Confirmation and Contextual Meanings
Waṣala al-ṭālibu simply reports an arrival. Qad waṣala al-ṭālibu emphasizes that the arrival has indeed occurred; both verbs remain past.