The Syrians were a Semitic people of the region of Syria, named in the Book of Mormon only within Nephi’s quotation of Isaiah. In the prophecy against the house of Israel, the Syrians attack from the front and the Philistines from behind, “and they shall devour Israel with open mouth”; the verse closes with the refrain “his anger is not turned away, but his hand is stretched out still” (2 Nephi 19:12).
Earlier in the same block of Isaiah quoted by Nephi, Syria appears as a kingdom under Rezin, who joined Pekah of Israel to march against Jerusalem in the days of Ahaz; its capital is identified as Damascus (2 Nephi 17:1-8).