Hebrews 12:26-28 New American Bible (Revised Edition) (NABRE)
26 His voice shook the earth at that time, but now he has promised, “I will once more shake not only earth but heaven.” 27 That phrase, “once more,” points to [the] removal of shaken, created things, so that what is unshaken may remain. 28 Therefore, we who are receiving the unshakable kingdom should have gratitude, with which we should offer worship pleasing to God in reverence and awe.
Hebrews 12:26-28 New International Version (NIV)
26 At that time his voice shook the earth, but now he has promised, “Once more I will shake not only the earth but also the heavens.”[a] 27 The words “once more” indicate the removing of what can be shaken—that is, created things—so that what cannot be shaken may remain.
28 Therefore, since we are receiving a kingdom that cannot be shaken, let us be thankful, and so worship God acceptably with reverence and awe,