Galatians 3:17; Galatians 4:11; Galatians 6:4

17 What I am saying is this: the Law, which came four hundred and thirty years later, does not invalidate a covenant previously ratified by God, so as to nullify the promise.
11 I fear for you, that perhaps I have labored over you in vain.
4 But each one must examine his own work, and then he will have reason for boasting in regard to himself alone, and not in regard to another.