King James Version
Read in contextHe that hath received his testimony hath set to his seal that God is true.
All translations
5 of 5 translations contain this numbered verse.
He that hath received his testimony hath set to his seal that God is true.
He who has received his witness has set his seal to this, that God is true.
He that hath received his witness hath set his seal to `this', that God is true.
he who is receiving his testimony did seal that God is true;
Whoever accepts His testimony has certified that God is truthful.