Or HaChaim on Exodus 20:16/אור החיים על שמות כ׳:ט״ז

1 דבר אתה עמנו, "Speak you with us, etc." The people meant that if acceptance of G'd's commandments was dependent on our listening to Him speak to us directly, this was no longer necessary. They said: "it is good enough for us to listen to His commandments as they come out of your mouth; we will consider this binding upon us. We do not wish to endanger our lives by being exposed to G'd's voice any longer." They said to Moses: "if you speak to us ונשמעה, we will be able to hear it (without dying). If G'd were to continue to speak to us we could not hear because we would die."