my mouth ... sword - (Isa 11:4; Rev 19:15). The double office of the Word of God, saving and damnatory, is implied (Isa 50:4; Joh 12:48; Heb 4:12).
shaft - (Psa 45:5). “Polished,” that is, free from all rust, implies His unsullied purity.
in ... quiver ... hid me - Like a sword in its scabbard, or a shaft in the quiver, Messiah, before His appearing, was hid with God, ready to be drawn forth at the moment God saw fit [Hengstenberg]; also always protected by God, as the arrow by the quiver (Isa 51:16).