'Confirm' in the Bible

but I have besought for thee that thy faith fail not; and thou, when once thou hast been restored, confirm thy brethren.

For I say that Jesus Christ became a minister of the circumcision for the truth of God, to confirm the promises of the fathers;

who shall also confirm you to the end, unimpeachable in the day of our Lord Jesus Christ.

and sent Timotheus, our brother and fellow-workman under God in the glad tidings of Christ, to confirm you and encourage you concerning your faith,