'Agreement' in the Bible

For in our letters we say no other things to you, but those which you are reading, and to which you give agreement, and, it is my hope, will go on doing so to the end:

Who has made us able to be servants of a new agreement; not of the letter, but of the Spirit: for the letter gives death, but the Spirit gives life.

But their minds were made hard: for to this very day at the reading of the old agreement the same veil is still unlifted; though it is taken away in Christ.

What agreement does Christ have with Belial? Or what does a believer have in common with an unbeliever?

And what agreement hath the temple of God with idols? for ye are the temple of the living God; as God hath said, I will dwell in them, and walk in them; and I will be their God, and they shall be my people.

Finally, brothers, rejoice, be restored, be encouraged, {be in agreement}, be at peace, and the God of love and peace will be with you.