Hebrews 12:25-26

25So be careful! Always be ready to listen when God speaks. God used Moses as his servant on the earth to speak to Israel's people. When they refused to obey, God punished them. They could not get away. As for us, God speaks to us from heaven. So we will certainly not get away from God's punishment if we turn away from him.

26At Sinai mountain many years ago, God's voice caused the earth to shake. But now God has promised this: ‘Once again I will cause the earth to shake. But this time I will also cause heaven to shake.’