قُلْ يُحْيِيهَا الَّذِي أَنْشَأَهَا أَوَّلَ مَرَّةٍ
Say: The One who brought them into being the first time will revive them. (Yā-Sīn 36:79)
«يُحْيِيهَا» is the overt imperfect verb with its object suffix. «الَّذِي» functions as its agent; «أَنْشَأَهَا أَوَّلَ مَرَّةٍ» is the relative clause specifying that agent. The action of revival is stated, not merely inferred.
Two effects follow:
1. The very action doubted by the objector is explicitly affirmed: «يُحْيِيهَا».
2. Initial creation is supplied as evidence for the ability to restore life.
The reply does more than identify an agent. It answers a challenge by asserting the act and supporting it. That is why full expression is better suited to this argumentative setting than a bare one-word answer.