'Assurance' in the Bible

But we want each of you to continue to be diligent to the very end, in order to give full assurance to your hope.

let us continue to come near with sincere hearts in the full assurance that faith provides, because our hearts have been sprinkled clean from a guilty conscience, and our bodies have been washed with pure water.

Now faith is the assurance that what we hope for will come about and the certainty that what we cannot see exists.