Romans 8:16

the same spirit testifies to our spirit, that we are the children of God.

2 Corinthians 1:22

and mark'd me with his seal, and given me the earnest of the spirit in my heart.

2 Corinthians 5:5

now he that hath prepared us for this very state, is God, who hath given us the spirit as a pledge of it.

Ephesians 1:13

by whom you also have heard the word of truth, the gospel of your salvation: and having believed in him, ye were mark'd with the seal of the holy spirit, which was promised:

2 Corinthians 1:12

for this is to me matter of glorying, the testimony of my conscience, that without artifice, and with religious sincerity, not by worldly wisdom, but by God's favourable assistance I have behaved my self towards all men, but more particularly to you.

Ephesians 4:30

grieve not the holy spirit of God, by whom you are sealed against the day of deliverance:

1 John 3:19-22

Hereby we shall know that we are true professors, and set our consciences securely at rest.

1 John 4:13

Hereby we know that we dwell in him, and he in us, because he hath given us of his spirit.

1 John 5:10

he that believeth on the son of God, hath the testimony of God thereto: he that does not believe God, impeaches his veracity, because he does not believe the testimony that God gave of his son.

Romans 8:23

and not only they, but even those who have the first fruits of the spirit, even we our selves do inwardly groan for the fruit of our adoption, by the deliverance of our body from corruption.

Romans 8:26

The spirit likewise softens our afflictions: for being at a loss to apply for the most proper relief; the spirit it self affects us with those pious ejaculations, which we can't well express.

Treasury of Scripture Knowledge

Summary

The Spirit itself beareth witness with our spirit, that we are the children of God:

General references

Bible References

Spirit

Romans 8:23
and not only they, but even those who have the first fruits of the spirit, even we our selves do inwardly groan for the fruit of our adoption, by the deliverance of our body from corruption.
2 Corinthians 1:22
and mark'd me with his seal, and given me the earnest of the spirit in my heart.
2 Corinthians 5:5
now he that hath prepared us for this very state, is God, who hath given us the spirit as a pledge of it.
Ephesians 1:13
by whom you also have heard the word of truth, the gospel of your salvation: and having believed in him, ye were mark'd with the seal of the holy spirit, which was promised:
Ephesians 4:30
grieve not the holy spirit of God, by whom you are sealed against the day of deliverance:
1 John 4:13
Hereby we know that we dwell in him, and he in us, because he hath given us of his spirit.

With our

2 Corinthians 1:12
for this is to me matter of glorying, the testimony of my conscience, that without artifice, and with religious sincerity, not by worldly wisdom, but by God's favourable assistance I have behaved my self towards all men, but more particularly to you.
1 John 3:19
Hereby we shall know that we are true professors, and set our consciences securely at rest.
1 John 5:10
he that believeth on the son of God, hath the testimony of God thereto: he that does not believe God, impeaches his veracity, because he does not believe the testimony that God gave of his son.

General references

Galatians 3:26
for you are all the sons of God by faith in Christ Jesus.