Deuteronomy 31:7,8

The inability of Moses to go over Jordan, and the ability of Joshua, should be well noticed by the Reader. As Moses' natural strength was not diminished, certain it is, his want of strength was not the cause; neither was the personal power of Joshua the reason of these things. But if we look at Moses as typical of the law, and Joshua as typical of JESUS and his gospel: then we see how impossible it was for the law to bring souls to GOD, and how suited alone that Almighty Joshua is, to plant his people in his holy mountain. For the law made nothing perfect; but a better hope did, by which we draw nigh unto GOD. Hebrews 7:19.