John the Baptist was the “forerunner of our Lord.” We have but fragmentary and imperfect accounts of him in the Gospels. He was of priestly descent. His father, Zacharias, was a priest of the course of Abia (1 Chr. 24:10), and his mother, Elisabeth, was of the daughters of Aaron (Luke 1:5). The mission of John was the subject of prophecy (Matt. 3:3; Isa. 40:3; Mal. 3:1). His birth, which took place six months before that of Jesus, was foretold by an angel. Zacharias, deprived of the power of speech as a token of God’s truth and a reproof of his own incredulity with reference to the birth of his son, had the power of speech restored to him on the occasion of his circumcision (Luke 1:64). After this no more is recorded of him for thirty years than what is mentioned in Luke 1:80. John was a Nazarite from his birth (Luke 1:15; Num. 6:1–12). He spent his early years in the mountainous tract of Judah lying between Jerusalem and the Dead Sea (Matt. 3:1–12).
Easton’s Bible Dictionary: John the Baptist