'Proof' in the Bible

Therefore openly before the churches, show them the proof of your love and of our reason for boasting about you.

Because of the proof given by this ministry, they will glorify God for your obedience to your confession of the gospel of Christ and for the liberality of your contribution to them and to all,

since you are seeking for proof of the Christ who speaks in me, and who is not weak toward you, but mighty in you.