Parallel
Romans 8:16
Patriarchal Greek New Testament (1904) · Berean Standard Bible
αὐτὸ τὸ Πνεῦμα συμμαρτυρεῖ τῷ πνεύματι ἡμῶν ὅτι ἐσμὲν τέκνα Θεοῦ.
The Spirit Himself testifies with our spirit that we are God’s children.