This saying of Moses contributed very greatly to faith in Christ. "If," he says, "a prophet arises who works miracles and leads away from God, do not believe him: he is the antichrist. But if a Prophet arises who works miracles and leads to God and the Father, especially not leading away from Him, believe Him." (Deut. 13:1–3) Thus, Christ, who came in the name of the Father, who worked miracles and did not lead them (the Jews) away from piety, was the very One about whom Moses prophesied.
Jn. 5:46. For if you believed Moses, you would have believed Me, because he wrote about Me.
Jn. 5:47. If you do not believe his writings, how will you believe My words?
If you do not believe the writings of Moses, how will you believe My words? "He," He says, "wrote, and the Bible is always before your eyes, so that even if you had forgotten, you can easily recall it, and yet you do not believe what is written — how then will you believe My unwritten words?"
Why then do You say this, Lord, when You know that they will not believe? "Although," He says, "I know that they will not listen, nevertheless I speak, so that they may not afterward claim, 'We would have believed, if You had told us.'"
And in another sense: His ungrateful contemporaries did not believe; but it would have been unjust to deprive of the benefit of Christ's words those who would come to believe in the course of time.