'Agreement' in the Bible

But when I saw that they were not living uprightly in agreement with the true words of the good news, I said to Cephas before them all, If you, being a Jew, are living like the Gentiles, and not like the Jews, how will you make the Gentiles do the same as the Jews?

Brothers, as men would say, even a man's agreement, when it has been made certain, may not be put on one side, or have additions made to it.

Now this I say: The law, which came four hundred and thirty years after, does not put an end to the agreement made before by God, so as to make the undertaking without effect.