Christ concealed in the Old Testament; Christ revealed in the New Testament.
As God wills.
But I say, Did not Israel know? First Moses saith, I will provoke you to jealousy by [them that are] no people, [and] by a foolish nation I will anger you. - Romans 10:19
I say then, Have they stumbled that they should fall? God forbid: but [rather] through their fall salvation [is come] unto the Gentiles, for to provoke them to jealousy. - Romans 11:11
And they sing the song of Moses the servant of God, and the song of the Lamb, saying, Great and marvellous [are] thy works, Lord God Almighty; just and true [are] thy ways, thou King of saints. - Revelation 15:3