Sammael

Sammael, A demon among the modern Jews, most commonly styled the Angel of Death. The rabbins allege that the removal from the present life of those who die in the land of Israel is assigned to Gabriel, whom they call an Angel of Mercy, while those who die in other countries are dispatched by the hand of Sammael, the prince of daemons. Several of the rabbins confidently assert that the latter has no power over the Jews, and God himself is represented as saying to him, "The world is in thy power except this people. I have given thee authority to root out the idolaters; but over this people I have given thee no power."

⇒See also the International Standard Bible Encyclopedia.