Isaiah 19:24

In that day shall Israel be the third with Egypt and with
Assyria
There shall be a triple alliance between them; Jew and Gentile shall be made one, the middle wall of partition being broken down; yea, Israel, or the Jews, shall be the third, or the Mediator between them both, or the means of uniting the Gentiles together, since the Gospel of peace was to go out from them, as it did. Perhaps there may be an allusion to the situation of the land of Israel between Egypt and Assyria:

[even] a blessing in the midst of the land;
or of the earth, the whole world, being the means of conveying the blessings of grace to the several nations of the world; the Messiah, in whom all nations are blessed, descending from them, and the Gospel being sent out from them unto all nations, which publishes the blessings of grace by Christ, and is the means both of the knowledge, application, and possession of them.