'Approval' in the Bible

Whoever receives His testimony has set his seal [of approval] to this: God is true [and he knows that God cannot lie].

I have come in My Father’s name and with His power, and you do not receive Me [because your minds are closed]; but if another comes in his own name and with no authority or power except his own, you will receive him and give your approval to an imposter.

for they loved the approval of men more than the approval of God.