'Confirmation' in the Bible

Further, he made all who were present in Jerusalem and Benjamin stand [with him, in confirmation of it]. So the inhabitants of Jerusalem acted in accordance with the covenant of God, the God of their fathers.

They have seen falsehood and lying divination, saying, ‘The Lord says,’ but the Lord has not sent them. Yet they hope and make men to hope for the confirmation of their word.

It is right for me to feel this way about you, because [you have me in your heart as] I have you in my heart, since both in my imprisonment and in the defense and confirmation of the good news [regarding salvation], all of you share in [His matchless] grace with me.

Indeed men swear [an oath] by one greater than themselves, and with them [in all disputes] the oath serves as confirmation [of what has been said] and is an end of the dispute.

And the Holy Spirit also adds His testimony to us [in confirmation of this]; for after having said,

Now faith is the assurance (title deed, confirmation) of things hoped for (divinely guaranteed), and the evidence of things not seen [the conviction of their reality—faith comprehends as fact what cannot be experienced by the physical senses].