'Guarantee' in the Bible

And God said, "This is the guarantee of the covenant I am making with you and every living creature with you, a covenant for all subsequent generations:

I will place my rainbow in the clouds, and it will become a guarantee of the covenant between me and the earth.

So God said to Noah, "This is the guarantee of the covenant that I am confirming between me and all living things that are on the earth."

I'll even offer myself to guarantee that I'll be responsible for him. If I don't bring him back and present him to you, I'll personally bear the consequences forever.

Also, your servant pledged his own life as a guarantee of the young man's safety. I told my father, "If I don't bring him back to you, you can blame me forever.'

Guarantee Your servant’s well-being;do not let the arrogant oppress me.

My son, if you guarantee a loan for your neighbor, if you have agreed to a deal with a stranger,

Don't be one of those who make promises to guarantee loans for debts.

"Tell Hezekiah, king of Judah, "This is what the mighty king, the king of Assyria, has to say: What is this "guarantee" that makes you yourself rely on it? Do you really think that guarantees alone can withstand strategy and military strength? On whom are you now depending, that you're rebelling against me?

This is why the promise is by faith, so that it may be according to grace, to guarantee it to all the descendants—not only to those who are of the law but also to those who are of Abraham’s faith. He is the father of us all

And He will also confirm you to the end [keeping you strong and free of any accusation, so that you will be] blameless and beyond reproach in the day [of the return] of our Lord Jesus Christ.

it is He who has also put His seal on us [that is, He has appropriated us and certified us as His] and has given us the [Holy] Spirit in our hearts as a pledge [like a security deposit to guarantee the fulfillment of His promise of eternal life].

God has prepared us for this and has given us his Spirit as a guarantee.

who is the guarantee of our inheritance until God redeems his own possession for his praise and glory.

So Jesus has also become the guarantee of a better covenant.