Pseudo-Kallisthenes 1.37.9-13

 

And Alexander said to them <the letter-carriers>:

`Now you fear punishment and beg for your lives, so I will let you free, if not for any other reason so that you can see the difference between a Hellenic king and a barbarian tyrant, so do not expect to suffer any harm from me. A king does not kill messengers.'

And having said these to them he invited them to dinner...