Romans 8:16

Αὐτὸ τὸ Πνεῦμα συμμαρτυρεῖ τῷ Πνεύματι ἡμῶν, ὅτι ἐσμὲν τέκνα Θεοῦ·

Ayto to Pneyma symmartyrei tō Pneymati ēmōn, oti esmen tekna Theoy·

King James Version (KJV)

The Spirit itself beareth witness with our spirit, that we are the children of God:

Modern English

The Spirit himself testifies with our spirit that we are God's children.