2 Kings 12:20 recounts the assassination of Joash—the very crime whose perpetrators Amaziah later executed in 2 Kings 14:5.

2 Kings 12:21 names the officials who murdered Amaziah’s father Joash — the same ones Amaziah executes here.

2 Kings 21:24 records the people executing King Amon’s murderers — a similar response to regicide as Amaziah’s.

Genesis 9:6 establishes the principle of capital punishment for murder, which Amaziah followed in executing his father's killers.

Exodus 21:12-14 provides the Mosaic law requiring execution for premeditated murder, justifying Amaziah's action.

Numbers 35:33 states that murder defiles the land and requires the murderer's blood, the principle behind Amaziah's execution.

2 Chronicles 25:3 is the parallel account of Amaziah executing his father’s murderers.

2 Chronicles 25:4 adds that Amaziah spared the assassins’ children, following the Law — a direct sequel to the execution in 14:5.

Deuteronomy 24:16 is the law Amaziah later cites (in 14:6) to justify not killing the children of the executed officials.