Caravaggio, Saint Jerome Writing (c. 1605), Galleria Borghese. Public domain.
2 verses in the King James Version. Word study for “three” →
For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one.
And there are three that bear witness in earth, the Spirit, and the water, and the blood: and these three agree in one.