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God the Holy Spirit is more than adequate witness for believers in fellowship with Him.

Heb 10:12-16
(12) But this man, after he had offered one sacrifice for sins for ever, sat down on the right hand of God;
(13) From henceforth expecting till his enemies be made his footstool.
(14) For by one offering he hath perfected for ever them that are sanctified.
(15) Whereof the Holy Ghost also is a witness to us: for after that he had said before,
(16) This is the covenant that I will make with them after those days, saith the Lord, I will put my laws into their hearts, and in their minds will I write them;