Romans 8:16
The Spirit is witness with our spirit that we are children of God:
2 Corinthians 1:22
And it is he who has put his stamp on us, even the Spirit, as the sign in our hearts of the coming glory.
2 Corinthians 5:5
Now he who has made us for this very thing is God, who has given us the Spirit as a witness of what is to come.
Ephesians 1:13
In whom you, having been given the true word, the good news of your salvation, and through your faith in him, were given the sign of the Holy Spirit of hope,
2 Corinthians 1:12
For our glory is in this, in the knowledge which we have that our way of life in the world, and most of all in relation to you, has been holy and true in the eyes of God; not in the wisdom of the flesh, but in the grace of God.
Ephesians 4:30
And do not give grief to the Holy Spirit of God, by whom you were marked for the day of salvation.
1 John 3:19-22
In this way we may be certain that we are true, and may give our heart comfort before him,
1 John 4:13
And his Spirit which he has given us is the witness that we are in him and he is in us.
1 John 5:10
He who has faith in the Son of God has the witness in himself: he who has not faith in God makes him false, because he has not faith in the witness which God has given about his Son.
Romans 8:23
And not only so, but we who have the first fruits of the Spirit, even we have sorrow in our minds, waiting for the time when we will take our place as sons, that is, the salvation of our bodies.
Romans 8:26
And in the same way the Spirit is a help to our feeble hearts: for we are not able to make prayer to God in the right way; but the Spirit puts our desires into words which are not in our power to say;