'Assure' in the Bible

Then He said to him, “I assure you and most solemnly say to you, you will see heaven opened and the angels of God ascending and descending on the Son of Man [the bridge between heaven and earth].”

Jesus answered him, “I assure you and most solemnly say to you, unless a person is born again [reborn from above—spiritually transformed, renewed, sanctified], he cannot [ever] see and experience the kingdom of God.”

Jesus answered, “I assure you and most solemnly say to you, unless one is born of water and the Spirit he cannot [ever] enter the kingdom of God.

I assure you and most solemnly say to you, we speak only of what we [absolutely] know and testify about what we have [actually] seen [as eyewitnesses]; and [still] you [reject our evidence and] do not accept our testimony.

So Jesus answered them by saying, “I assure you and most solemnly say to you, the Son can do nothing of Himself [of His own accord], unless it is something He sees the Father doing; for whatever things the Father does, the Son [in His turn] also does in the same way.

“I assure you and most solemnly say to you, the person who hears My word [the one who heeds My message], and believes and trusts in Him who sent Me, has (possesses now) eternal life [that is, eternal life actually begins—the believer is transformed], and does not come into judgment and condemnation, but has passed [over] from death into life.

I assure you and most solemnly say to you, a time is coming and is [here] now, when the dead will hear the voice of the Son of God, and those who hear it will live.

Jesus answered, “I assure you and most solemnly say to you, you have been searching for Me, not because you saw the signs (attesting miracles), but because you ate the loaves and were filled.

Then Jesus said to them, “I assure you and most solemnly say to you, it is not Moses who has given you the bread out of heaven, but it is My Father who gives you the true bread out of heaven.

I assure you and most solemnly say to you, he who believes [in Me as Savior—whoever adheres to, trusts in, relies on, and has faith in Me—already] has eternal life [that is, now possesses it].

And Jesus said to them, “I assure you and most solemnly say to you, unless you eat the flesh of the Son of Man and drink His blood [unless you believe in Me as Savior and believe in the saving power of My blood which will be shed for you], you do not have life in yourselves.

Jesus answered, “I assure you and most solemnly say to you, everyone who practices sin habitually is a slave of sin.

I assure you and most solemnly say to you, if anyone keeps My word [by living in accordance with My message] he will indeed never, ever see and experience death.”

Jesus replied, “I assure you and most solemnly say to you, before Abraham was born, I Am.”

“I assure you and most solemnly say to you, he who does not enter by the door into the sheepfold, but climbs up from some other place [on the stone wall], that one is a thief and a robber.

So Jesus said again, “I assure you and most solemnly say to you, I am the Door for the sheep [leading to life].

I assure you and most solemnly say to you, unless a grain of wheat falls into the earth and dies, it remains alone [just one grain, never more]. But if it dies, it produces much grain and yields a harvest.

I assure you and most solemnly say to you, a slave is not greater than his master, nor is one who is sent greater than the one who sent him.

I assure you and most solemnly say to you, the one who receives and welcomes whomever I send receives Me; and the one who receives Me receives Him who sent Me [in that same way].”

After Jesus had said these things, He was troubled in spirit, and testified and said, “I assure you and most solemnly say to you, one of you will betray Me and hand Me over.”

Jesus answered, “Will you [really] lay down your life for Me? I assure you and most solemnly say to you, before a rooster crows you will deny and completely disown Me three times.

I assure you and most solemnly say to you, anyone who believes in Me [as Savior] will also do the things that I do; and he will do even greater things than these [in extent and outreach], because I am going to the Father.

I assure you and most solemnly say to you, that you will weep and grieve [in great mourning], but the world will rejoice. You will be sorrowful, but your sorrow will be turned into joy.

In that day you will not [need to] ask Me about anything. I assure you and most solemnly say to you, whatever you ask the Father in My name [as My representative], He will give you.

I assure you and most solemnly say to you, when you were younger you dressed yourself and walked wherever you wished; but when you grow old, you will stretch out your hands and arms, and someone else will dress you, and carry you where you do not wish to go.”

I assure you, believers, by the pride which I have in you in [your union with] Christ Jesus our Lord, I die daily [I face death and die to self].

Therefore I urge you to reinstate him in your affections and reaffirm your love for him.