Exodus 19:16-19 provides the original account of the trumpet and voice that terrified Israel, which Hebrews recalls.

Exodus 20:1-17 contains the very words spoken by the voice that the people in Hebrews begged to stop.

Exodus 20:18 records the people's fear at the trumpet and thunder, directly matching the blast of the trumpet in Hebrews.

In Exodus 20:19, the Israelites plead with Moses to mediate because they fear dying from God's voice — the exact plea Hebrews 12:19 recalls.

Deuteronomy 4:12 describes hearing the voice without seeing a form, reinforcing the awe of the Sinai revelation.

Deuteronomy 4:33 highlights the unprecedented miracle of hearing God's voice and surviving, undergirding the terror.

Deuteronomy 5:3-22 retells the covenant at Horeb including the people's fear, the exact scene Hebrews references.

In Deuteronomy 5:24-27, the people ask Moses to hear God and relay His words, fearing death — another account of the same request Hebrews 12:19 alludes to.

In Deuteronomy 18:16, the people's request at Horeb not to hear God's voice directly is recalled — the same sentiment behind the plea in Hebrews 12:19.

In Deuteronomy 5:27, the people ask Moses to go hear God and tell them — this is the specific request for mediation that Hebrews 12:19 references.

Exodus 20:22 confirms God spoke from heaven, the same voice that caused fear in Hebrews.

In Deuteronomy 4:10, the assembly at Horeb where God spoke His words is described — the background context for the fear mentioned in Hebrews 12:19.