Two men, Moses and Elijah, appeared in glorious splendor, talking with Jesus.
Moses died long time ago. Had Moses resurrected already in the holy mountain? Because he was talking with Jesus.
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The fact that Moses (and Elias) appeared (the verb is ὁράω Strong 3708) and then after the overshadowing of a cloud, they disappeared and Jesus was found alone, Luke 9:36, strongly suggests that this was not a substantial, physical resurrection but an 'appearance' or manifestation.
Jesus Christ is the first to rise from the dead in resurrection as Paul states in Colossians 1:18 :
And he is the head of the body, the church: who is the beginning, the firstborn from the dead; that in all things he might have the preeminence.
It is Christ who rises first and, thus, has pre-eminence over all.
Instances of temporary resurrection (such as Lazarus and others) are only indicative of permanent resurrection. The final and unending resurrection being here suggested for Moses is inappropriate for it is Jesus Christ who first arises and dies no more.