Romans 8:16
The Spirit itself (Greek:autos ho pneuma) (itself the Spirit) bears witness with our spirit (mind and heart), that we are children of God.
2 Corinthians 1:22
He also sealed us, and gave us the guarantee of the Spirit in our hearts.
2 Corinthians 5:5
He that prepared us for this very purpose is God. He gave the Spirit to us as a guarantee (pledge) (security).
Ephesians 1:13
You have heard the word of the truth in Christ. It is the good news about your salvation. You also believed and were sealed with the promised Holy Spirit.
2 Corinthians 1:12
This is our pride and testimony of conscience. In holiness and Godly sincerity we behaved ourselves in the world, and more abundantly toward you. It was not by fleshly wisdom but by the grace of God.
Ephesians 4:30
Do not grieve the Holy Spirit of God, in which (Greek: en hos) (in which) (Greek: hos, he ho) (whereby) (which) you were sealed to the day of release by ransom.
1 John 3:19-22
By this we shall know we are of the truth, and will assure our heart before him.
1 John 4:13
We know that we live with him and he with us, because he has given us of his Spirit.
1 John 5:10
He who believes in the Son of God has the witness in him. He who does not believe God made him a liar because he does not believe the testimony God gives concerning his Son.
Romans 8:23
We also, who have the first fruits of the Spirit, even we groan within ourselves, waiting for the adoption and the release from our bodies by ransom.
Romans 8:26
Likewise the Spirit also helps our weaknesses. We do not know what we should pray for, as we should. The Spirit [of God] makes intercession with groaning that cannot be spoken.