'Assurance' in the Bible

So your life shall hang in doubt before you; and you will be in dread night and day, and shall have no assurance of your life.

“But He drags off the valiant by His power;He rises, but no one has assurance of life.

that their hearts may be encouraged, having been knit together in love, and attaining to all the wealth that comes from the full assurance of understanding, resulting in a true knowledge of God’s mystery, that is, Christ Himself,

For we have become partakers of Christ, if we hold fast the beginning of our assurance firm until the end,

And we desire that each one of you show the same diligence so as to realize the full assurance of hope until the end,

let us draw near with a sincere heart in full assurance of faith, having our hearts sprinkled clean from an evil conscience and our bodies washed with pure water.

Now faith is the assurance of things hoped for, the conviction of things not seen.