Hebrews 2:2 states every transgression under the old covenant received just retribution — the same principle underlying the death penalty for setting aside the law.

In Hebrews 12:25, the warning against refusing God's voice from heaven uses the same logic: if they did not escape under Moses, we will not escape.

In Hebrews 2:3, the same lesser-to-greater argument warns that neglecting the great salvation brings worse judgment than disobeying Moses' law.

Numbers 15:30 defines 'high-handed' sin as reviling the Lord and being cut off — the very law Hebrews 10:28 cites as requiring death without mercy.

Deuteronomy 17:2-13 requires death on two or three witnesses for idolatry — the specific law Hebrews 10:28 alludes to with 'on the evidence of two or three witnesses.'

Deuteronomy 17:6 is the exact source for the two-witness requirement used in capital punishment — cited in Hebrews 10:28.

Deuteronomy 17:7 details that witnesses cast the first stones — the full execution procedure behind the penalty in Hebrews 10:28.

2 Samuel 12:13 declares David's sin put away and he will not die — a direct mercy that contrasts with the law's demand for death in Hebrews 10:28.

In 2 Corinthians 13:1, Paul applies the same two-witness principle to church discipline, echoing the OT law cited here.

Numbers 35:30 states the same law: a murderer may only be put to death on multiple witnesses — the very principle referenced here.

In 1 Timothy 5:19, the same 'two or three witnesses' rule from Moses' law is applied to elders, extending the legal principle seen in Hebrews 10:28.

Acts 3:23 quotes Moses about destroying those who reject the prophet, reinforcing severe consequences for disobedience.

Numbers 15:31 adds that despising the Lord's word brings being cut off — reinforcing the severity of willful sin that Hebrews 10:28 references.

John 8:17 cites the same law about two witnesses — Jesus uses it to validate his testimony, echoing the legal principle.

Matthew 18:16 applies the same two-witness principle to church discipline — showing continuity from OT law to NT practice.

2 Samuel 12:9 shows David despising God's word by murder and adultery — a violation deserving death, yet mercy was shown, contrasting with Hebrews 10:28's 'without mercy.'

Numbers 15:36 records the stoning of the Sabbath-breaker — a concrete example of the death penalty 'without mercy' that Hebrews 10:28 describes.

Romans 9:15 emphasizes God's sovereign right to show mercy — contrasting with the law's absolute penalty without mercy.

Deuteronomy 19:15 applies the two-witness rule to all legal matters — broader than the capital case in Hebrews 10:28.

Deuteronomy 13:6-10 commands stoning for anyone who entices to idolatry — another capital law that illustrates the Mosaic penalty Hebrews 10:28 points to.

James 2:13 applies the same principle: judgment without mercy for those who show no mercy — expanding it beyond Mosaic law.