Is Hebrews 12:25 an allusion to the Judgement pronounced by Noah, or by Moses/Yahweh at Sinai?

Is the statement, "warned them on earth" (v25) an allusion to the judgement pronounced by Noah, or by Moses and Yahweh at Sinai? See to it that you do not refuse Him who is speaking. For if those did not escape when they refused him wh...