John Wesley on Isaiah 66:20

Your brethren - Those who are the children of Abraham, not considered as the father of the Jewish nation only, but considered as the father of many nations, and as the father of the faithful, and so are your brethren, shall be brought out of all nations for an offering to the Lord. Holy mountain - And they shall be brought into the church, which began at Jerusalem. As - And they shall come with as much joy and gladness, with as much sincerity and holiness, as the Godly Jews do when they bring their offerings in clean vessels.