2 Kings 18:17 sets the stage: the Assyrian commander's arrival and challenge, which leads to the blasphemy referenced here.

2 Kings 18:35 records the specific blasphemous claim that no god can deliver from Assyria—the very words Hezekiah is told not to fear.

2 Kings 18:25 records the Assyrian's claim that God sent him — the blasphemy God tells Hezekiah not to fear.

In 2 Kings 6:16, Elisha tells his servant not to fear the Syrian army, echoing the same 'do not be afraid' reassurance against a larger enemy.

Isaiah 51:12 asks why fear mortal man, reinforcing the message that God comforts His people against human threats.

Isaiah 51:7 directly addresses fear of human reproach and reviling, echoing the same call not to be afraid of blasphemous words.

Isaiah 37:6-38 gives the parallel account of this same event, repeating the command not to fear Assyria's blasphemy.

Psalm 74:23 mentions the continual uproar of foes against God, mirroring the persistent blasphemy of the Assyrian servants.

Psalm 74:18 recalls how enemies scoff and revile God's name, a direct parallel to the Assyrian blasphemy here.

2 Chronicles 20:15 tells Jehoshaphat not to fear a vast army because the battle is God's — the same message Isaiah delivers to Hezekiah.

Deuteronomy 20:4 gives the reason not to fear: God fights for you — the same assurance behind Isaiah's message to Hezekiah.

Deuteronomy 20:1 directly commands not to fear a larger enemy army, matching Isaiah's instruction to Hezekiah not to fear Assyria.

2 Chronicles 32:7 records Hezekiah's parallel encouragement not to fear Assyria — reinforcing the same divine reassurance.

Joshua 11:6 has God tell Joshua not to fear enemy kings, promising victory — parallel to Isaiah's reassurance here.

Leviticus 26:8 promises that a few will rout many enemies, reinforcing the reason not to fear the vast Assyrian army here.

Isaiah 41:10-14 extends the 'fear not' command to all Israel with promises of help—a general reassurance that parallels the specific situation here.

Exodus 14:13 has Moses telling Israel not to fear the Egyptians, promising God's deliverance — similar to Isaiah's command here.