'Confirmed' in the Bible

And Judas and Silas, being themselves also prophets, exhorted the brethren with many words, and confirmed them.

even as the testimony of Christ was confirmed in you:

Brethren, I speak after the manner of men: Though it be but a man's covenant, yet when it hath been confirmed, no one maketh it void, or addeth thereto.

Now this I say: A covenant confirmed beforehand by God, the law, which came four hundred and thirty years after, doth not disannul, so as to make the promise of none effect.

how shall we escape, if we neglect so great a salvation? which having at the first been spoken through the Lord, was confirmed unto us by them that heard;