'Secure' in the Bible

Because of this, [it is] by faith, in order that [it may be] according to grace, so that the promise may be secure to all the descendants, not only to those of the law, but also to those of the faith of Abraham, who is the father of us all

who was betrayed and crucified because of our sins, and was raised [from the dead] because of our justification [our acquittal—absolving us of all sin before God].