Exodus 19:21 reinforces the boundary warning, adding that even looking could cause death.

Exodus 19:23 shows Moses affirming the boundary command, confirming its seriousness.

In Exodus 19:24, God repeats the warning not to break through, reinforcing the same boundary command within the same event.

In Exodus 3:5, God instructs Moses to remove sandals on holy ground, establishing a similar reverence for the mountain.

In Exodus 34:3, God again prohibits anyone from going up the mountain, reaffirming the boundary after the golden calf incident.

Hebrews 12:20 directly quotes the boundary command from Exodus 19:12 to illustrate the terror of the old covenant.

In Hebrews 12:18, the Sinai mountain that could be touched is contrasted with Mount Zion, using the exact imagery of the boundary.

In Genesis 3:3, Eve recalls God's command not to touch the forbidden fruit, mirroring the boundary and death penalty at Sinai.

In Numbers 4:15, the Kohathites are told not to touch holy things or die, paralleling the principle of deadly holiness at Sinai.

Joshua 3:4 similarly commands keeping distance from the ark, echoing the holiness boundary at Sinai.