Midrash su Isaia 12:1

Reuben, Simeon, and all the other tribes were mentioned because of the future redemption of Israel. Reuben: I have surely seen the affliction of my people (Exod. 3:7). Simeon: And God heard their groaning (ibid. 2:24). Levi: Many nations will attach themselves to the Lord (Zech. 2:15). Judah: I will give thanks unto Thee, O Lord, for though Thou wast angry with me, Thine anger is turned away and Thou comfortest me (Isa. 12:1). Issachar: For thy ways shall be rewarded (Jer. 31:16). Zebulun: I have surely built thee a house of habitation (I Kings 8:13). Benjamin: The Lord hath sworn by His right hand (Isa. 62:18). Dan: And also that nation, whom they shall serve, will I judge (Gen. 15:14). Naphtali: Thy lips, O my bride, drop honey (Song 4:11). Gad: Now the manna was like coriander seed (Num. 11:7). Asher: And all the nations shall call you happy (Mal. 3:12). Joseph: The Lord will set His hand again the second time (Isa. 11:1).

JUDAH (rt.: YDH) (in Is. 12:1): AND IN THAT DAY YOU SHALL SAY: I GIVE THANKS (rt.: YDH) TO YOU, O LORD.

Another interpretation: He said to him: Sovereign of the World, you have been proclaimed (in Micah 7:18): WHO IS A GOD LIKE YOU, FORGIVING SIN AND PASSING OVER TRANSGRESSION? (Gen. 4:13:) MY SIN IS GREATER THAN I CAN BEAR. The Holy One said to him: You have repented. By your life, I am revoking one decree from you. Thus it is stated (in Gen. 4:16): AND CAIN WENT OUT FROM BEFORE THE LORD AND DWELT IN THE LAND OF NOD. While he was going away, the first Adam met him. He said to him: What happened about your sentence. He said: If I had not confessed, I should already have disappeared from the world. Adam said at that time (in Ps. 92:2 [1]): IT IS GOOD TO CONFESS TO THE LORD. In this world individuals confess to the Holy One, but in the world to come they all confess to him. So it is stated (in Is. 12:1): I WILL CONFESS TO YOU, O LORD; FOR, THOUGH YOU WERE ANGRY WITH ME, YOUR ANGER IS TURNED AWAY, AND YOU COMFORT ME.