Hebrews 3:15; Hebrews 4:7; Hebrews 12:19; Hebrews 12:26

15 While it is said , To day if ye will hear his voice, harden not your hearts, as in the provocation.
7 Again, he limiteth a certain day, saying in David, To day, after so long a time; as it is said , To day if ye will hear his voice, harden not your hearts.
19 And the sound of a trumpet, and the voice of words; which voice they that heard intreated that the word should not be spoken to them any more:
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.