'Assurance' in the Bible

Seeing that many have attempted to draw up a narrative of the facts which are received with full assurance among us

For the words which You gave Me I have given them; and they received and accepted them and truly understood [with confident assurance] that I came from You [from Your presence], and they believed [without any doubt] that You sent Me.

Because he hath appointed a day, in the which he will judge the world in righteousness by that man whom he hath ordained; whereof he hath given assurance unto all men, in that he hath raised him from the dead.

For what assurance have you, O woman, as to whether you will save your husband? Or what assurance have you, O man, as to whether you will save your wife?

It was with this confidence that I planned at first to visit you, so that you might receive twice a token of grace;

That their hearts might be comforted, being knit together in love, and unto all riches of the full assurance of understanding, to the acknowledgement of the mystery of God, and of the Father, and of Christ;

For our gospel came not unto you in word only, but also in power, and in the Holy Ghost, and in much assurance; as ye know what manner of men we were among you for your sake.

Those ministers who serve well gain an excellent reputation for themselves and will have great assurance by their faith in the Messiah Jesus.

And thou -- watch in all things; suffer evil; do the work of one proclaiming good news; of thy ministration make full assurance,

For we are become companions of the Christ if indeed we hold the beginning of the assurance firm to the end;

And we desire that every one of you do shew the same diligence to the full assurance of hope unto the end:

Let us draw near with a true heart in full assurance of faith, having our hearts sprinkled from an evil conscience, and our bodies 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.

For all that is in the world—the lust and sensual craving of the flesh and the lust and longing of the eyes and the boastful pride of life [pretentious confidence in one’s resources or in the stability of earthly things]—these do not come from the Father, but are from the world.

Now, little children (believers, dear ones), remain in Him [with unwavering faith], so that when He appears [at His return], we may have [perfect] confidence and not be ashamed and shrink away from Him at His coming.

Beloved, if our heart does not convict us [of guilt], we have confidence [complete assurance and boldness] before God;

In this [union and fellowship with Him], love is completed and perfected with us, so that we may have confidence in the day of judgment [with assurance and boldness to face Him]; because as He is, so are we in this world.

This is the [remarkable degree of] confidence which we [as believers are entitled to] have before Him: that if we ask anything according to His will, [that is, consistent with His plan and purpose] He hears us.

“I, Jesus, have sent My angel to testify to you and to give you assurance of these things for the churches. I am the Root (the Source, the Life) and the Offspring of David, the radiant and bright Morning Star.”