In the millennium Christ the King will break the staff of the wicked who have continually persecuted and oppressed Israel; and He will give them rest for a thousand years (Isa. 14:3-6). And all during that long period the Lord Christ will be their refuge and stronghold (Joel 3:16). And He will camp around them, and the oppressor will no longer come near them (Zech. 9:8). And the beasts of the earth will not devour them; but they will live securely, and no one will make them afraid” (Ezek. 34:28).
So it seems that in the millennium God will bring comfort to all those who have been oppressed (Isa. 61:2); but He will bring a special comfort to Israel. They will receive “a double portion.” Here are a few passages that describe this.
Isaiah 51:3 Indeed, the Lord will comfort Zion; He will comfort all her waste places. And her wilderness He will make like Eden, And her desert like the garden of the Lord; Joy and gladness will be found in her, Thanksgiving and sound of a melody. Isaiah 61:7 Instead of your shame you will have a double portion, And instead of humiliation they will shout for joy over their portion. Therefore they will possess a double portion in their land, Everlasting joy will be theirs. Isaiah 66:12-13 For thus says the Lord, “Behold, I extend peace to her like a river, And the glory of the nations like an overflowing stream; And you shall be nursed, you shall be carried on the hip and fondled on the knees. 13 “As one whom his mother comforts, so I will comfort you; And you shall be comforted in Jerusalem.” Zechariah 9:11-12 As for you also, because of the blood of My covenant with you, I have set your prisoners free from the waterless pit. 12 Return to the stronghold, O prisoners who have the hope; This very day I am declaring that I will restore double to you.
Now it almost seems from these verses that Israel will receive comfort primarily from all the prosperity He brings them; however, I think her greatest comfort will be in God and in the salvation and pardon He brings them through His Son (Isa. 40:1-2; 49:8). (References used: Isa. 12:1-2; 14:3-6; 30:26; 40:1-2; 41:1-2; 41:8-14; 42:6-7; 49:9, 13; 51:3; 61:2-7; 66:13-14; Jer. 23:6; 31:23-25; Ezek. 34; 27; Joel 3:16-17; Amos 9:15; Zeph. 3:18-20; Zech. 8:14-15; 9:8, 11-12; 14:10-11.)