EDIT: Looks like others already gave you good responses.
As was mentioned in the first response to you, there appeared to be a dispute over Moses' body. The usual pattern spelled out in Scripture is that the resurrection of the body happens at the last trumpet, at the coming of Jesus. But Moses was an exception.
And from Satan's perspective he appears to have disputed this (chronologically this was before Jesus' death for sinners, though by God's plan He is the Lamb of God slain from the foundation of the world). But of course he has no power to resist God.
A couple other things to look at. Moses died without entering the promised land:
Deuteronomy 34:1 Then Moses went up from the plains of Moab to Mount Nebo, to the top of Pisgah, which is across from Jericho. And the Lord showed him all the land of Gilead as far as Dan, 2 all Naphtali and the land of Ephraim and Manasseh, all the land of Judah as far as the Western Sea, 3 the South, and the plain of the Valley of Jericho, the city of palm trees, as far as Zoar. 4 Then the Lord said to him, “This is the land of which I swore to give Abraham, Isaac, and Jacob, saying, ‘I will give it to your descendants.’ I have caused you to see it with your eyes, but you shall not cross over there.” 5 So Moses the servant of the Lord died there in the land of Moab, according to the word of the Lord. 6 And He buried him in a valley in the land of Moab, opposite Beth Peor; but no one knows his grave to this day. 7 Moses was one hundred and twenty years old when he died. His eyes were not dim nor his natural vigor diminished. 8 And the children of Israel wept for Moses in the plains of Moab thirty days. So the days of weeping and mourning for Moses ended.
Yet in the Gospels He is present with Elijah discussing Jesus' upcoming sacrifice:
Luke 9:28 Now it came to pass, about eight days after these sayings, that He took Peter, John, and James and went up on the mountain to pray. 29 As He prayed, the appearance of His face was altered, and His robe became white and glistening. 30 And behold, two men talked with Him, who were Moses and Elijah, 31 who appeared in glory and spoke of His decease which He was about to accomplish at Jerusalem.
Elijah if you recall did not die but was translated. So you have both here to discuss Jesus' coming death on the cross. They faced opposition from those who should have received their message, and could encourage Jesus who was facing the same.
About a possible source for the account of the dispute over Moses' body:
Assumption of Moses - Wikipedia
Jude also quotes from Enoch in his work.
The phrasing, "The Lord rebuke you" is seen also in Zechariah in another dispute with Satan over one of the redeemed:
Zechariah 3:1 Then he showed me Joshua the high priest standing before the Angel of the Lord, and Satan standing at his right hand to oppose him. 2 And the Lord said to Satan, “The Lord rebuke you, Satan! The Lord who has chosen Jerusalem rebuke you! Is this not a brand plucked from the fire?”
3 Now Joshua was clothed with filthy garments, and was standing before the Angel.
4 Then He answered and spoke to those who stood before Him, saying, “Take away the filthy garments from him.” And to him He said, “See, I have removed your iniquity from you, and I will clothe you with rich robes.”
5 And I said, “Let them put a clean turban on his head.”
So they put a clean turban on his head, and they put the clothes on him. And the Angel of the Lord stood by.