Jamieson, Fausset and Brown on Genesis 24:15-21

15-21. before he had done speaking ... behold, Rebekah came out--As he anticipated, a young woman unveiled, as in pastoral regions, appeared with her pitcher on her shoulder. Her comely appearance, her affable manners, her obliging courtesy in going down the steps to fetch water not only to him but to pour it into the trough for his camels, afforded him the most agreeable surprise. She was the very person his imagination had pictured, and he proceeded to reward her civility.