In Judaism an angel (Hebrew: מַלְאָךְ mal’akh, plural mal’akhim) is a messenger of God, an angelic envoy or an angel in general who appears throughout the Hebrew Bible, Rabbinic literature, and traditional Jewish liturgy. Angels in Judaism are categorized in different hierarchies.
Hebrew mal’akh () is the standard Hebrew Bible word for "messenger", both human and divine, though it is rarely used for human messengers in Modern Hebrew as the latter is usually denoted by the term shaliyah (שליח). In the King James Bible, the noun mal’akh is rendered "angel" 111 times, "messenger" 98 times, "ambassadors" 4 times. The noun derives from the verbal consonantal root l-’-k (ל-א-ך), meaning specifically "to send with a message" and with time was substituted with more applicable sh-l-h. In Biblical Hebrew this root is attested only in this noun and in the noun "Mel’akah" (), meaning "work", "occupation" or "craftsmanship".
The morphological structure of the word mal’akh suggests that it is the maqtal form of the root denoting the tool or the mean of performing it. The term Mal'akh therefore simply means the one who is sent, often translated as "messenger" when applied to humans; for instance, Mal’akh is the root of the name of the prophet Malachi, whose name means "my messenger". In modern Hebrew, mal’akh is the general word for "angel"; it is also the word for "angel" in Arabic (malak ملاك), Aramaic and Ethiopic.
The Hebrew Bible reports that angels appeared to each of the Patriarchs, to Moses, Joshua, and numerous other figures. They appear to Hagar in Genesis 16:9, to Lot in Genesis 19:1, and to Abraham in Genesis 22:11, they ascend and descend Jacob's Ladder in Genesis 28:12 and appear to Jacob again in Genesis 31:11–13. God promises to send one to Moses in Exodus 33:2, and sends one to stand in the way of Balaam in Numbers 22:31.