1 John 5:9 - Joseph Benson’s Commentary on the Old and New Testaments

If we receive the testimony of men As we do continually, and must do, in a thousand instances, if we would not give over all business, and even refuse taking necessary nourishment. The testimony of two or three credible witnesses, according to the law of Moses, was deemed sufficient to prove any matter of fact; and indeed human affairs in general, even the most important, are conducted and determined by depending on the testimony of men. Nay, and we not only receive the testimony of men, when they bear their testimony in a solemn manner, upon oath, before magistrates, but we rely on one another's word from time to time, and sometimes concerning things of great moment: the testimony of God is greater More valid, of higher authority, and much more worthy to be received than the witness of men, be they ever so numerous, or ever so respectable for their understanding and their integrity; so that we may rely on it with the greatest assurance. For this is the testimony of God Namely, this six-fold testimony, and especially that of the last three mentioned witnesses, of the Father, the Word, and the Holy Ghost: which he hath testified of his Son As the true Messiah, the Saviour of the world, able to save, even to the uttermost, all that come unto God by him; and actually saving all that believe in him with their heart unto righteousness.