Both Preached a Message of Repentance & Death to Self
Elijah: And Elijah said unto him, Tarry, I pray thee, here; for the LORD hath sent me to Jordan. 2 Kings 2:6
John the Baptist: Then went out to him Jerusalem, and all Judaea, and all the region round about Jordan, And were baptized of him in Jordan, confessing their sins. Matthew 3:5,6
Elijah: And Elijah said unto him, Tarry, I pray thee, here; for the LORD hath sent me to Jordan. 2 Kings 2:6
John the Baptist: Then went out to him Jerusalem, and all Judaea, and all the region round about Jordan, And were baptized of him in Jordan, confessing their sins. Matthew 3:5,6