GEN931 It is more important to invite guests who truly need your hospitality than to invite those who do not.  Rabbi Yudan explained that Avraham’s guests did not rally require refreshment since they were angels.  They merely appeared to be eating and drinking in order to please Avraham.   As a result of Avraham’s act of kindness, the Almighty rewarded his descendants when they were in the Sinai desert.   They received the manna, a well of water sprung up for them, they were provided with quails, they were encircled by clouds of glory, and a pillar of cloud journeyed before them.   Rabbi Shimon, in the name of Rabbi Eliezer, said that the aforementioned act of kindness and subsequent reward constitute a kal vechomer (an interference from minor to major): “Avraham was greatly rewarded for showing kindness to those who did not need kindness.   All the more so, the Almighty rewards someone who shows kindness to those who need it.”  Leviticus 34:8  The Chofetz Chayim writes that although the mitzvah of having guests applies even when the guest is wealthy and not in dire need of your favors, it is a greater mitzvah to have guests who arte poor. He adds that people are happy to entertain wealthy guests and will honor them as much a possible.   But, unfortunately, they are much less anxious – sometimes even reluctant – to have truly needy people as guests. Ahavas Chesed, part 3, ch. 1.  PLYN 68