'Kindness' in the Bible

Saul said to the Kenites, "Go, depart, go down from among the Amalekites, lest I destroy you with them; for you showed kindness to all the children of Israel, when they came up out of Egypt." So the Kenites departed from among the Amalekites.

but also you shall not cut off your kindness from my house forever; no, not when Yahweh has cut off the enemies of David everyone from the surface of the earth."