Musar zu Bereschit 24:20

By Rivka: "and she hastened and emptied her pitcher in the trough..." (Bereishis 24:20).

When a man comes to realize as truth the great value of the Mitzvot and the greatness of his obligation in them, his heart will certainly be awakened to the service of G-d and he will not be lax in it.

ותמהר ותער כדה של השוקת ותרץ עוד אל הבאר לשאוב ותשאב לכל גמליו . Rebeccah displayed remarkably ethical conduct here. She showed respect for fellow human beings. First she let Eliezer drink. When some water was left over in the jug, she did not know what to do. She debated whether to give the left-over water to the camels. In doing this, however, she would place man and beast on the same level by letting both of them drink from the same vessel. If, on the other hand, she would pour out the left-over water, this would also be a lack of respect, since drinking water would be demoted to the status of dirty waste water. What did she do? She "ran" as if to give the camels to drink. While running, she pretended to fall, so that the water spilled from the jug. She then had an excuse to fill the jug anew from the well. In this way Eliezer was not slighted at all.