Cyrill of Alexandria
And the Lord spoke to Ahaz, instructing him to request a sign from the Lord his God, whether it be from the depths or from the heights. However, Ahaz replied that he would not ask for a sign, implying he would test the Lord instead. As the ruler of Jerusalem, Ahaz was heavily entangled in immoral practices and the worship of false gods, yet he still sought a path toward righteousness and an understanding of true wisdom about the Lord. The servants of idols, revered for their status, were intent on inquiring about their futures, seeking divinations from sacred sites, and falling prey to the deceit of false prophets during times of peril.
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This misguided bent led Ahaz to consider similar actions, but the Lord commanded him to seek a sign not from the usual temples or deceitful prophets, but directly from the Lord God Himself. The Lord also specified how Ahaz should make his request, saying it may be from the depths or heights—referring to the heavens or the earth, and even beyond. This underscored that as the sovereign God, He possesses the authority to act according to His will, whether Ahaz wishes to witness wonders in heaven or those on earth.