1 John 3:19

And by this we know that we are of the truth, and shall assure our hearts before him;

John 13:35

By this shall all know that you are my disciples, if you have love one for another.

John 18:37

Then Pilate said to him, Are you a king then? Jesus answered, As you say, I am a king. For this was I born, and for this I came into the world, that I should testify to the truth; every one who is of the truth hears my voice.

Romans 4:21

being fully persuaded that what he had promised he was able to perform.

Romans 8:38

For I am persuaded that neither death nor life, nor angels nor principalities, nor things present nor things to come, nor powers,

2 Timothy 1:12

for which cause I suffer these things; but I am not ashamed; for I know in whom I have believed, and am persuaded that he is able to keep my trust to that day.

Hebrews 6:10-11

For God is not unjust, to forget your work, and the love which you showed for his name, having served the saints and [still] serving them.

Hebrews 10:22

let us approach with a true heart in a full assurance of faith, sprinkled in heart from an evil conscience, and washed in body with pure water,

Hebrews 11:13

All these died in faith not having received the promises, but having seen and saluted them from a distance, and having professed that they were foreigners and strangers on the earth.

1 John 1:8

If we say we have not sin, we deceive ourselves, and the truth is not in us.

1 John 3:14

We know that we have passed from death to life, because we love the brothers; he that loves not, continues in death.

1 John 3:21

Beloved, if our minds do not condemn us, we have boldness before God,

Treasury of Scripture Knowledge

Summary

And hereby we know that we are of the truth, and shall assure our hearts before him.

Bible References

Shall

1 John 3:21
Beloved, if our minds do not condemn us, we have boldness before God,
Hebrews 6:10
For God is not unjust, to forget your work, and the love which you showed for his name, having served the saints and [still] serving them.
Hebrews 10:22
let us approach with a true heart in a full assurance of faith, sprinkled in heart from an evil conscience, and washed in body with pure water,

Assure

Romans 4:21
being fully persuaded that what he had promised he was able to perform.
Romans 8:38
For I am persuaded that neither death nor life, nor angels nor principalities, nor things present nor things to come, nor powers,
2 Timothy 1:12
for which cause I suffer these things; but I am not ashamed; for I know in whom I have believed, and am persuaded that he is able to keep my trust to that day.
Hebrews 11:13
All these died in faith not having received the promises, but having seen and saluted them from a distance, and having professed that they were foreigners and strangers on the earth.