MNT(i)
25 See that you do not refuse him who is speaking. For if they did not escape punishment when they refused to listen to their instructor on earth, much less shall we escape if we turn away from him who is teaching us from heaven;
26 whose voice then shook the earth, but now he has promised, saying, Once again, once for all, I make not only earth, but heaven also to tremble.
27 That phrase, "Once again," signifies the removal of the things which can be shaken, created things, in order that the things which cannot be shaken may remain.
28 Wherefore since we are receiving a kingdom which is unshakable, let us give thanks, and so offer acceptable worship to God, with holy awe and fear,
29 FOR INDEED OUR GOD IS A CONSUMING FIRE.