'Confirm' in the Bible

Judas also and Silas, being themselves also prophets, through much discourse did exhort the brethren, and confirm,

And I say Jesus Christ to have become a ministrant of circumcision for the truth of God, to confirm the promises to the fathers,

who also shall confirm you unto the end -- unblamable in the day of our Lord Jesus Christ;

wherefore, I call upon you to confirm love to him,