Gemilut hasadim, the bestowing of lovingkindness, is the rabbinic category for personal acts of care. The Mishnah places it among the three things on which the world stands, Torah, service, and acts of lovingkindness (Avot 1:2), and lists it among the deeds that have no fixed measure, whose fruits a person enjoys in this world while the principal remains for the world to come, a passage recited in the daily morning liturgy (Peah 1:1).
The tradition distinguishes it from tzedakah, charity, and the distinction is exact. The Talmud states that lovingkindness is greater in three respects: charity is given with money whereas lovingkindness may be given with one's own person, charity is for the poor whereas lovingkindness is owed to rich and poor alike, and charity is for the living whereas lovingkindness extends to the dead (Sukkah 49b). The last point identifies the tradition's limiting case: care of the dead, and accompanying them to burial, is called hesed shel emet, true kindness, on the reasoning that it is the one kindness that cannot possibly be repaid.
The standard instances are concrete rather than abstract: visiting the sick, hospitality to guests, providing for a bride, escorting travellers, comforting mourners, and burying the dead. Around each of these an institutional history grew, the burial societies, the free-loan funds, the sick-visiting and hospitality associations that were standard features of Jewish communal organisation across Europe and the Ottoman lands, and their modern successors in synagogue committees and social service agencies.
Its theological anchor is imitation of God. The Talmud reads the command to "walk after the LORD your God" as an instruction to imitate God's attributes, and then specifies them from the narratives: as God clothed the naked, visited the sick, comforted mourners and buried the dead, so should you (Sotah 14a). The argument is characteristic of rabbinic ethics in deriving the content of obligation from what the biblical God is depicted doing rather than from a definition of the good.