[Jhn 6:35-36 KJV] 35 And
Jesus said unto them, I am the bread of life: he that cometh to me shall never hunger; and he that believeth on me shall never thirst. 36 But I said unto you, That ye also have seen me, and believe not.
[Jhn 6:35 NIV] 35
Then Jesus declared, "I am the bread of life. Whoever comes to me will never go hungry, and whoever believes in me will never be thirsty.
There are more verses, but it's pertinent to see and read the entirety of Chapter 6 of the Gospel of John to have a better understanding. Again, I remind you that one verse does not a doctrine make, and that context of the entirety of scripture provides greater understanding through the Spirit of God.
It's always comes down to the manuscripts that are used to determine a specific wording used here or there, but as long as the context is understood, since in the case of John chapter 6 is Jesus speaking about Himself, it is not loss that He is pointing to believing in Him. For even if one were to ask themselves the question that you posed "Believes WHAT?" reading the rest of this chapter in context, and/or other books as well, one sees that the answer to your question is belief in Jesus. Yes, even reading the NIV.
With the Love of Christ Jesus.
Moderator
Nick
\o/