'Prove' in the Bible

I speak not by commandment, but by occasion of the forwardness of others, and to prove the sincerity of your love.

But I sent the brothers so our boasting about you in the matter would not prove empty, and so you would be prepared just as I said.

Examine yourselves, whether ye be in the faith; prove your own selves. Know ye not your own selves, how that Jesus Christ is in you, except ye be reprobates?