Hebrews 12:25-26

See to it that you do not refuse [to listen to] Him who is speaking [to you now]. For if those [sons of Israel] did not escape when they refused [to listen to] him who warned them on earth [revealing God’s will], how much less will we escape if we turn our backs on Him who warns from heaven? [Heb 2:1-4] His voice shook the earth [at Mount Sinai] then, but now He has given a promise, saying, “YET ONCE MORE I WILL SHAKE NOT ONLY THE EARTH, BUT ALSO THE [starry] HEAVEN.” [Hag 2:6]