βεβαιόω

And they went forth, and preached every where, the Lord working with them, and confirming the word with signs following. Amen.

Now I say that Jesus Christ was a minister of the circumcision for the truth of God, to confirm the promises made unto the fathers:

Even as the testimony of Christ was confirmed in you:

Who shall also confirm you unto the end, that ye may be blameless in the day of our Lord Jesus Christ.

Now he which stablisheth us with you in Christ, and hath anointed us, is God;

Rooted and built up in him, and stablished in the faith, as ye have been taught, abounding therein with thanksgiving.

How shall we escape, if we neglect so great salvation; which at the first began to be spoken by the Lord, and was confirmed unto us by them that heard him;

Be not carried about with divers and strange doctrines. For it is a good thing that the heart be established with grace; not with meats, which have not profited them that have been occupied therein.