See note Isa. 60:19².

In the restoration God in Christ will be Israel’s glory and beauty, and Israel will be God’s glory and beauty (v. 21; 61:3b). Thus, God and His chosen people will be glorified and beautified in mutuality. This will be accomplished by the divine dispensing through Christ as the Redeemer and the Savior putting Himself into God’s people as the life-giving Spirit and the word (Isa. 59:21).

In the New Jerusalem Israel will enjoy Jehovah in Christ, the Servant of Jehovah, as the eternal light (vv. 19-20; Rev. 21:23; 22:5).

Glory here refers to the products of the nations (Gen. 31:1, 16; Esth. 1:4).

Today the nation of Israel is suffering under the pressure of the nations, but when Christ returns, Israel will rise up. When Christ comes back as the saving Redeemer, Israel as God’s elect and as the center of the world’s population will be restored in every respect. At that time, all the Gentile nations will be for Israel (vv. 3-14).

Christ as the Servant of Jehovah is the light of Israel and the glory of Jehovah rising upon Israel at His return (vv. 1-3). The entire earth today, including Israel, is under darkness. But when Christ comes as a Redeemer to Israel (Isa. 59:20), He will be their light to enlighten them, which light is the glory of God, i.e., God Himself in His glory (cf. Rev. 21:23; 22:5).