John 3:11

Verily, verily, I say unto thee, we speak that we do know,.... Meaning either himself, and John the Baptist his forerunner, who preached the same doctrine of regeneration, internal sanctification, and evangelical repentance, as well as outward reformation, as necessary to entrance into the kingdom of heaven, or the Gospel dispensation, he declared was just at hand; or his disciples with himself, who were now with him, and whom he had called to preach the same truths he himself did; or the prophets of the Old Testament, who agreed with him in these things; or the Father that was with him, and never left him alone, and the Holy Spirit that was upon him, by whom he was anointed to preach these things, and who spoke them in him; or else he may use the plural number of himself alone, as being one in authority, and speaking with it, as he sometimes did, Mark 4:30, and the rather this seems to be the sense, since he immediately, in the next verse, speaks in the singular number, "if I have told you earthly things", c. Now Christ must needs thoroughly, and certainly know what he spoke, since he was not only the omniscient God, but, as Mediator, had all the treasures of wisdom and knowledge in him, and the spirit of wisdom and knowledge rested on him:

and testify that we have seen and therefore ought to have been received as a credible witness, as he was a faithful one; since "seeing" and "knowing" are qualifications in a witness, Leviticus 5:1; and though these were eminently in Christ, the generality of the Jews gave no credit to his testimony:

and ye received not our witness; which was an aggravation of their sin and unbelief; see John 3:32.