'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.'