ישעיהו יד:א פירוש: רש״י ואבן עזרא

For the Lord shall have mercy on Jacob to keep for them the promise of their redemption from Babylonia.

For the Lord will have mercy, etc. When Babylon was taken, Cyrus allowed the exiled Jews to return home.

and again choose Israel in the future, He shall redeem them with a complete redemption.