Quotation zu Kohelet 4:1

One of the foundations of Torah morality is the duty to offer protection to the weak and helpless such as widows, orphans, the newcomers within the community, and the dead. These obligations are emphasized because they offer the one who protects the helpless a special opportunity to experience a relationship with God. No direct reward is anticipated from the powerless, for they lack the resources to repay the kindness. Therefore, the reward can only come from God, and such rewards can be expected to derive from the world which is not under the sun. In Biblical code, these duties are often marked by the phrase, "Remember that you were strangers in Egypt, I am the Lord your God." Compare the Babylonian Talmud, Tractate Berachot, p. 19a, and its discussion of the obligation to bury an unclaimed corpse.