Cyrill of Alexandria
He states that once Babylon is laid waste and the proud are brought low, the nations will recognize the might of God that brings about their downfall. When those who once mocked the shattered and doomed Israel witness its triumphant return to its homeland and sacred city, with its oppressors completely vanquished, they will amend their speech and begin to extol the greatness of God. In former times, they were misguided, believing that Judah was captured because the Babylonian tyrant had seemingly conquered the One who had aided them, namely, the Lord. Thus, when they observe the reversal of their fortunes, they will adapt their languages by families and tribes to honor God.
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Despite the geographical distances that separate them, even residing far away in the lands of Ethiopia, they will unite under one allegiance and present offerings. This interpretation pertains to the literal meaning of the scripture in question. Yet, we maintain that these words were fulfilled at the advent of Christ and serve as a vivid indication of the transformation of tongues.
As recorded in the Acts of the Holy Apostles, it is stated that during the days of Holy Pentecost, all were gathered in one place and suddenly there came from heaven a sound like a mighty rushing wind, filling the entire house where they were sitting. And flames of fire appeared to them, dividing and resting on each one of them. They were all filled with the Holy Spirit and began to speak in different languages as the Spirit enabled them (Acts 2:1-4). At that moment, he signifies, I will change my speech ‘to the people’, for they heard them speaking in their own languages (Acts 2:6), including the Parthians, Medes, Elamites, and others. It is crucial to note that he remarked about altering the tongue 'into his kin,' implying that the language will be retained by those who once held it for the entirety of their lineage. Thus, it served as a sign for those on whom, as Scripture indicates, tongues descended (Acts 2:3). Consequently, he declares, I will change ‘the tongue into his generation’. However, such a transformation had not yet occurred for those who came after. The wise Apostle Paul elucidates this point, stating that ‘the tongues are not for the believers, but for the unbelievers’, as it is written: ‘I will speak in other tongues, and with other lips I will address this people, but they will not listen’ (Isaiah 28:11-12; 1 Corinthians 14:21-22). The beneficial aspect of the language transformation ‘in his generation’ is clarified by Him, where He asserts: ‘I will invoke all to call upon the name of the Lord, to serve under one banner; from the ends of the rivers of Ethiopia they shall bring offerings to me.’
Indeed, as the apostles spoke in diverse tongues and the people were astounded by this miracle, many who sought the name of the one true God embraced the Christian message, serving Christ and offering sacrifices ‘from the ends of the rivers of Ethiopia’. The territory of Ethiopia stretches from the east to the west, with inhabitants along the river Geon, as it is stated, ‘this is the perimeter of all the land of Ethiopia’ (Gen. 2:13). In this way, the prophetic promise is realized, for the Gospel is proclaimed not only in the Roman territories but has also reached the nations considered barbaric. Consequently, churches, shepherds and instructors, leaders and altars spring up everywhere; even the spiritual feast of the Lamb is shared among the holy ministers, including those from India and Ethiopia. Another prophet clearly articulated this, stating, 'For I am a great King,’ declares the Lord, ‘and My name is feared among the nations; My name is honored among the Gentiles, and in every place, incense is offered to My name, along with a pure offering' (Malachi 1:11, 14).