Romans 8:16
"The Spirit itself beareth witness with our spirit, that we are the children of God:"Romans 8:16 (KJV)
Context from Romans 8
14
For as many as are led by the Spirit of God, they are the sons of God.
15
For ye have not received the spirit of bondage again to fear; but ye have received the Spirit of adoption, whereby we cry, Abba, Father.
16
The Spirit itself beareth witness with our spirit, that we are the children of God:
17
And if children, then heirs; heirs of God, and joint-heirs with Christ; if so be that we suffer with him, that we may be also glorified together.
18
For I reckon that the sufferings of this present time are not worthy to be compared with the glory which shall be revealed in us.