'Need' in the Bible

and because he did not {need} anyone {to testify} about man, for he himself knew what was in man.

For some were thinking because Judas had the money box, Jesus was telling him, "Purchase {what we need} for the feast," or that he should give something to the poor.)

Now we know that you know everything and do not {need for} anyone to ask you [questions]. By this we believe that you have come from God."