New International Version. Very truly I tell you, the one who believes has eternal life.

Truly, truly, I tell you, whoever hears My word and believes Him who sent Me has eternal life and will not come under judgment.

Jesus is claiming that His statement is unquestionably true and He has absolute, direct, personal knowledge of its truth.

47 Verily, verily, I say unto you, He that believeth on me hath everlasting life. Read full chapter · John 6:47 in all English translations.

John 6:47 — New Living Translation (NLT). 47 “I tell you the truth, anyone who believes has eternal life.

I am the living bread which came down from heaven: if any man eat of this bread, he shall live for ever: and the bread that I will give is my flesh.

47Very truly, I tell you, whoever believes has eternal life. 48I am the bread of life. 49Your ancestors ate the manna in the wilderness, and they died.

“I'm telling you the most solemn and sober truth now: Whoever believes in me has real life, eternal life. I am the Bread of Life.

Jesus came to satisfy this hunger in the heart of all mankind: "Truly, truly, I say to you, he who believes (in Me) has eternal life."