God has said through his prophets, "In the mouth of two or three witnesses shall every word be established." (2 Corinthians 13:1.) Nephi was apparently aware of this system of witnesses when he introduced three great pre-Christian witnesses of the coming of Jesus Christ: Isaiah, Nephi himself, and Nephi's brother Jacob. Nephi then continues: "Wherefore, by the words of three, God hath said, I will establish my word." (2 Nephi 11:3.)