Interestingly, the Jewish Targum interpreted Psalm 68 as referring to the ascension of Moses, who now gives the Law as a gift to the world. But Paul interprets Psalm 68 in light of Christ’s ascension actually having occurred (Ephesians 4). It is not the ascension of Moses, but of Christ, that Paul proclaims. Even if Moses had ascended to heaven (as later Jewish tradition held), Christ has ascended “far above all the heavens” (v. 10) and his gift is not Torah but peace.
Horton, Michael; The Gospel Driven Life: Being Good News People in a Bad News World; Baker Books; Grand Rapids, MI; Copyright 2009; page 181