Justification of Believers Is By:

God

Romans 3:26

He did it to demonstrate his justice at the present time, so as to be just and the one who justifies those who have faith in Jesus.

Christ’s resurrection

Romans 4:25

He was delivered over to death for our sins and was raised to life for our justification.

Holy Spirit

1 Corinthians 6:11

And that is what some of you were. But you were washed, you were sanctified, you were justified in the name of the Lord Jesus Christ and by the Spirit of our God.

Blood

Romans 3:24-28

24 and are justified freely by his grace through the redemption that came by Christ Jesus.

25 God presented him as a sacrifice of atonement, through faith in his blood. He did this to demonstrate his justice, because in his forbearance he had left the sins committed beforehand unpunished—

26 he did it to demonstrate his justice at the present time, so as to be just and the one who justifies those who have faith in Jesus.

27 Where, then, is boasting? It is excluded. On what principle? On that of observing the law? No, but on that of faith.

28 For we maintain that a man is justified by faith apart from observing the law.

Grace

Romans 3:24

And are justified freely by his grace through the redemption that came by Christ Jesus.

Titus 3:7

So that, having been justified by his grace, we might become heirs having the hope of eternal life.