Infallibility in the Old Testament?

I'm catholic and I live in Brazil. I believe in the gift of the infallibility in the New Testament, but i'm trying to understand if Jews, in the old covenant (Old Testament) were infallible too. I found some clues, like: 1 Samuel 9,6 ; John 11,51 ; 2 Peter 1,21 seem to teach infallibility of the prophets of the Old testament. However, it is impossible that the old covenant were TOTALLY infallible, because if it was so, they would in the first place, have recognized Jesus Christ as the true Messiah. So where does all this leave us? Were they "sometimes" infallible? Was there a limit to it? I found your link to an article here, but the link is broken :(https://christianity.stackexchange.com/questions/65996/the-chair-of-moses-and-jewish-clerical-infallibility) And this is the link you put: https://christiantheorist.weebly.com/basics-of-the-holy-faith/category/01-the-church-of-jesus-the-christ-is-one Could you help me with this, sir? I would love to read your insights about this theme!