G‑d appeared to Abraham…but he looked up and saw that there were three men… (Genesis 18:2) Abraham put aside his encounter with G‑d in order to greet his guests. From this we learn that hosting guests is so great that it takes priority over an encounter with G‑d. (Maimonides, Mishneh Torah) The three men that Abraham greeted and fed turned out to be angels. Angels don’t eat or drink. Neither do they need a place to sleep. They only pretended to eat and drink out of respect for Abraham. If so, what did Abraham accomplish? He served food to beings that never hunger and drinks to beings that never thirst. For this he walked out of a private audience with G‑d Himself?! And how can we learn from his...