KJV
He that hath received his testimony hath set to his seal that God is true.
WEB
He who has received his witness has set his seal to this, that God is true.
NASB
The one who has accepted His testimony has certified that God is true.
NLT
Anyone who accepts his testimony can affirm that God is true.
Greek · word by word
◆ marks a word that differs across manuscript
traditions — present in some texts, absent in others.