There is one who accuses you: Moses, on whom you have set your hope. 46 For if you believed Moses, you would believe me; for he wrote of me. 47 But if you do not believe his writings, how will you believe my wordsJohn 5:45–47 (ESV)
Jesus, in his discourse with the Jews, tells of the witnesses that point to Him and the validity of His ministry. These four witnesses include John the Baptist, Jesus’ works, the Father, and the Scriptures.