G4828–συμμαρτυρέω–summartureō

Because the work of the law is seen in their hearts, their sense of right and wrong giving witness to it, while their minds are at one time judging them and at another giving them approval;

συμμαρτυρούσης summarturousēs “are bearing witness”

The Spirit is witness with our spirit that we are children of God:

συμμαρτυρεῖ summarturei “bears witness with”

I say what is true in Christ, and not what is false, my mind giving witness with me in the Holy Spirit,

συμμαρτυρούσης summarturousēs “while is bearing witness”