'Bearing Witness' in the Bible

Which shew the work of the law written in their hearts, their conscience also bearing witness, and their thoughts the mean while accusing or else excusing one another;)

But now a righteousness coming from God has been brought to light apart from any Law, both Law and Prophets bearing witness to it--

The Spirit himself unites with our spirits in bearing witness to our being God's children,

I say the truth in Christ, I lie not, my conscience bearing witness with me in the Holy Spirit,