And it shall come to pass in the last days, that the mountain of the LORD's house shall be established in the top of the mountains, and shall be exalted above the hills; and all nations shall flow unto it (Isaiah 2:2).
Another prophecy to the same purpose, still more explicit, you have in Isa. 19:18,21, In that day shall five cities in the land of Egypt speak the language of Canaan, and swear to the Lord of hosts. The period when this shall be accomplished is here mentioned, in that day. The prophets frequently speak of the gospel times in this manner, and it must be considered as referring to that period. Five cities of the land of Egypt are the objects of this prophecy. Egypt is here mentioned to signify the Gentile world, a part is put for the whole, and one nation only is mentioned to signify the rest of the Gentile nations. Five cities in the land of Egypt signify many cities in many lands. They shall speak the language of Canaan. They shall become acquainted with divine revelation, know the glorious truths of the gospel, and have the holy law made plain before them. By this work of grace the Lord shall turn to them a pure language. It is also declared, they shall swear to the Lord of hosts. Upon no rational or religious grounds can it ever be denied, that these words are a clear prophecy, that public swearing to God, or covenanting with him, should be the exercise of the church in new testament times. It is not a swearing by the Lord, but a swearing to him, of which the Spirit of prophecy here speaks. In this religious oath, which the Gentile nations should swear, the Lord is not merely the object appealed unto, as the witness and the avenger; but he is the object to whom the oath is made, and to whom it is to be fulfilled. Both these exercises which are mentioned here are explained in verse 21, And the Lord shall be known to Egypt, and the Egyptians shall know the Lord in that day—Yea, they shall vow a vow unto the Lord, and perform it. The Egyptians speaking the language of Canaan is the same with their knowing the Lord, and their swearing unto the Lord is of the same import with their vowing a vow unto him. The exercise of public vowing and swearing to the Lord continues to be a duty incumbent upon Christians in new testament times, since the Spirit of God has expressly foretold, that, during this period, they should be so employed (emphases added).
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