How do we know the substitutionary atonement of Christ is true?

In the book of Esther, the character of Esther serves as a profound type of Christ, representing a mediator who intercedes for her people. This narrative illustrates the principle that salvation comes through a substitute who bears the burden of condemnation in place of the guilty. Scriptural patterns demonstrate that throughout the Old Testament, God revealed His redemptive plan progressively, culminating in Jesus Christ who is both the Lamb of God and our High Priest, fulfilling the requirements of the law by His death and resurrection, effectively providing atonement for His people.