Kevin Beck wrote"Jesus’ teaching springs up as an outgrowth of his message concerning the imminent fulfillment of God’s promises on his generation. “The kingdom of God is at hand.” What does that have to do with mountain-moving faith? Jesus called people along the Galilean hillside to believe the gospel — the kingdom announcement. He invited them as the firstfruits of Israel to participate with him in the messianic work of transformation. Through their faith in God’s word, they would move the largest mountain they could imagine — Sinai. In its place, Mount Zion would materialize. "
In his famous allegory of Hagar and Sarah, the apostle Paul understood Sinai to signify Israel — and hence humanity — under the burden of law. With the arrival of the New Jerusalem, ISRAEL AND HUMANITY WOULD BE DELIVERED INTO ULTIMATE LIBERTY. For Paul, these “things are symbolic. For these are the two covenants: the one from Mount Sinai which gives birth to bondage, which is Hagar — for this Hagar is Mount Sinai in Arabia, and corresponds to Jerusalem which now is, and is in bondage with her children — but the Jerusalem above is free, which is the mother of us all” (Galatians 4:23-26).
transmillennial.wordpress.com/2008/08/28/parousiawhat-mountain/