[Ali Imran]

“This is the disciple who testifies of these things, and wrote these things; and we know that his testimony is true. And there are also many other things that Jesus did, which if they were written one by one, I suppose that even the world itself could not contain the books that would be written. Amen.”
‭‭John‬ ‭21‬:‭24‬-‭25‬ ‭NKJV

So that means there are many other teachings of Jesus that we don't know because it was not recorded.