The Lord Jesus, by his perfect obedience and sacrifice of himself, which he through the eternal Spirit once offered up unto God, hath fully satisfied the justice of his Father; and purchased not only reconciliation, but an everlasting inheritance in the kingdom of heaven, for all those whom the Father hath given unto him.
Although the work of redemption was not actually wrought by Christ till after his incarnation, yet the virtue, efficacy, and benefits thereof were communicated unto the elect, in all ages successively from the beginning of the world, in and by those promises, types, and sacrifices wherein he was revealed, and signified to be the seed of the woman, which should bruise the serpent"s head, and the Lamb slain from the beginning of the world, being yesterday and today the same and for ever.
Westminster Confession of Faith
CHAPTER VIII - Of Christ the Mediator