John 3:32

³⁰ He must increase, but I must decrease.

³¹ He that cometh from above is above all: he that is of the earth is earthly, and speaketh of the earth: he that cometh from heaven is above all.

And what he hath seen and heard, that he testifieth; and no man receiveth his testimony.

³³ He that hath received his testimony hath set to his seal that God is true.

³⁴ For he whom God hath sent speaketh the words of God: for God giveth not the Spirit by measure unto him.

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB: He testifies to what He has seen and heard, yet no one accepts His testimony.
KJV: And what he hath seen and heard, that he testifieth; and no man receiveth his testimony.
WEB: What he has seen and heard, of that he testifies; and no one receives his witness.
ASV: What he hath seen and heard, of that he beareth witness; and no man receiveth his witness.
DARBY: [and] what he has seen and has heard, this he testifies; and no one receives his testimony.
BLB: What He has seen and heard, to this He testifies, and no one receives His testimony.

ÅB: det han har sett og hørt, det vitner han, og ingen tar imot hans vitnesbyrd;
OTB: Han vitner om det han har sett og hørt, men hans vitnesbyrd blir ikke akseptert av noen.
B1930: det han har sett og hørt, det vidner han, og ingen tar imot hans vidnesbyrd;

John 3:11
Verily, verily, I say unto thee, We speak that we do know, and testify that we have seen; and ye receive not our witness.
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John 15:15
Henceforth I call you not servants; for the servant knoweth not what his lord doeth: but I have called you friends; for all things that I have heard of my Father I have made known unto you.
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John 1:11
He came unto his own, and his own received him not.
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John 8:26
I have many things to say and to judge of you: but he that sent me is true; and I speak to the world those things which I have heard of him.
Read in context
John 5:20
For the Father loveth the Son, and sheweth him all things that himself doeth: and he will shew him greater works than these, that ye may marvel.
Read in context
John 3:33
He that hath received his testimony hath set to his seal that God is true.
Read in context