'Confirm' in the Bible

For I say, Christ has become a servant of the circumcision on behalf of the truth of God, in order to confirm the promises to the fathers,

who will also confirm you until the end, blameless in the day of our Lord Jesus Christ.

Therefore I urge you to confirm [your] love for him.

And the God of all grace, who called you to his eternal glory in Christ, [after you] have suffered for a short time, will himself restore, confirm, strengthen, [and] establish [you].