Matthew 21:37

ὕστερον, not afterwards merely, but finally, the last step was now to be taken, the mission of the son and heir; excuses conceivable hitherto: doubt as to credentials, a provoking manner in those sent, etc.; not yet conclusively proved that deliberate defiance is intended. The patient master will make that clear before taking further steps. ἐντραπήσονται (pass. for mid.), they will show respect to. It is assumed that they will have no difficulty in knowing him.