What is the prophecy "once more I shake not the earth only" refering to?

[SwimmingforGold1996]

Hebrews 12:26 - Whose voice then shook the earth: but now he hath promised, saying, Yet once more I shake not the earth only, but also heaven.

[Muldah]

Hbr 12:27 This means that the things on earth will be shaken, so that only eternal things will be left.

It's the NLT rendering:

http://www.blueletterbible.org/tools/printerFriendly.cfm?b=Hbr&c=12&t=NLT&x=2&y=7

[Muldah]

Hbr 12:27 This means that the things on earth will be shaken, so that only eternal things will be left.

It's the NLT rendering:

http://www.blueletterbible.org/tools/printerFriendly.cfm?b=Hbr&c=12&t=NLT&x=2&y=7

[mas1az]

In the history of mankind, this world has changed from dispensation to dispensation, through the power of God. When Christ died on the cross for three days, it was dark throughout the world. The sun did not shine. Yet, many don't know that upon that also, the earth shook, just as it did when Mose's people angered God and they built a golden calf. The ground opened up and swallowed thousands of them, but people don't talk much about it.

This earth shall be shaken to it's very core, and all that falls, shall not be of God. Heaven itself shall shake also, for the resurrection of the dead shall be done, and as Gods chosen shall be changed in the blink of an eye from mortality to immortality, so will the dead be resurrected in the flesh.

The day of the Lord is coming and the world is far from ready for it. For many's faith shall weaken as they see their cathedrals, churches and synagogues break apart, and yet, they will ask themselves Why?

But those who follow God and not men, will not fear in those days, for they know that it has to happen for Christ to return, along with the new Jerusalem. Not all believe in the new Jerusalem.