GOD'S WORD® Translation
I have accepted what that person said, and I have affirmed that God is truthful.

American Standard Version
He that hath received his witness hath set his seal to this , that God is true.

Berean Study Bible
Whoever accepts His testimony has certified that God is truthful.

Douay-Rheims Bible
He that hath received his testimony, hath set to his seal that God is true.

English Revised Version
He that hath received his witness hath set his seal to this, that God is true.

King James Bible
He that hath received his testimony hath set to his seal that God is true.

World English Bible
He who has received his witness has set his seal to this, that God is true.

Young's Literal Translation
he who is receiving his testimony did seal that God is true;

John 3:33 Additional Translations ...