Tradition
St. Irenaeus
Fragments from the Lost Writings of Irenaeus
Chapter 20
“And he laid his hands upon him.” The countenance of Joshua was also glorified by the imposition of the hands of Moses, but not to the same degree [as that of Moses]. Inasmuch, then, as he had obtained a certain degree of grace, [the Lord] said, “And you shall confer upon him of your glory.” For [in this case] the thing given does not cease to belong to the giver.
Source: Fragments from the Lost Writings of Irenaeus (New Advent)