1 Corinthians 6:17
But he who is joined to the Lord is one spirit.
John 3:5
Jesus answered, Truly, truly, I say to you, Unless one is born of water and the Spirit, he cannot enter into the kingdom of God.
John 3:6
That which is born of the flesh is flesh, and that which is born of the Spirit is spirit.
Romans 8:15
For you have not received a spirit of slavery bringing you into fear again, but you have received a spirit of sonship in which we cry, Abba, Father!
Romans 8:16
The Spirit Himself witnesses with our spirit that we are children of God.