2 Chronicles 20:33 notes the people had not yet set their hearts on God, the negative counterpart to the heart attitude Hezekiah highlights.

2 Chronicles 19:3 uses the exact phrase 'set your heart to seek God,' praising Jehoshaphat for the same disposition Hezekiah prays for.

2 Chronicles 12:14 says Rehoboam 'did not set his heart to seek the LORD' — the opposite of the heart attitude praised here.

In 2 Chronicles 11:16, the same phrase 'set their hearts on seeking the LORD' describes faithful Israelites who came to Jerusalem.

2 Chronicles 14:4 records Asa commanding Judah to seek the LORD — a parallel command to seek God, though not the same 'set heart' phrase.

Leviticus 15:31-33 warns of death for uncleanness defiling the tabernacle — the penalty Hezekiah asks God to avert for those with right hearts.

In Proverbs 23:26, the call to 'give me your heart' echoes Hezekiah's condition for pardon — setting heart to seek God.

Ezra 7:10 says Ezra 'had set his heart to study the Law,' using the same idiom as Hezekiah's prayer for those seeking God.

Numbers 19:13-20 provides the purification law for dead-body uncleanness — the ritual requirement Hezekiah asks God to bypass for sincere hearts.

Numbers 9:6 describes men who were unclean from a dead body and could not keep Passover — the same problem that prompted Hezekiah's prayer.

Leviticus 22:3-6 threatens cutting off those who eat holy offerings while unclean — directly the situation Hezekiah asks pardon for.

2 Kings 5:18 records Naaman's request for pardon when bowing in a pagan temple — a similar plea for divine leniency in a compromised situation.

Psalm 78:8 warns against a generation with a heart not steadfast, contrasting with the sincere seekers in 2 Chronicles 30:19.

1 Chronicles 29:18 asks God to 'direct their hearts toward you,' a prayer similar to Hezekiah's plea for those seeking God.

Hebrews 9:13 describes OT purification by animal blood — the external ritual Hezekiah's people lacked, showing its insufficiency for a right heart.

1 Samuel 7:3 calls Israel to 'direct your heart to the LORD,' matching the language of setting the heart to seek God.

Job 11:13 urges to 'prepare your heart,' a similar concept of intentional devotion that Hezekiah commends.

Psalm 10:17 says God hears the desire of the afflicted and strengthens their heart, echoing the theme of God responding to heartfelt seeking.

Psalm 14:2 says the LORD looks for those who seek God — a parallel theme of seeking, though from God's perspective.

Exodus 19:22 commands priests to consecrate themselves before approaching God — contrasting with Hezekiah's plea for those who are not consecrated.

Lamentations 3:25 declares the LORD is good to the soul who seeks him — reinforcing the blessing on seekers like those in 2 Chronicles 30:19.