1 John 3:19 directly precedes this verse, speaking of reassuring our heart—the immediate context for confidence.

1 John 5:14 describes confidence in prayer, which flows from the clear heart and obedience mentioned here.

1 John 4:17 links perfected love to confidence on judgment day—here a non-condemning heart gives boldness now.

1 John 2:28 promises confidence at Christ's coming—here a clear heart provides present confidence before God.

Job 27:6 says his heart does not reproach him—identical condition for confidence in 1 John 3:21.

In Psalm 7:3-5, David protests his innocence with a similar claim — if he has done wrong, let enemies pursue him. His clear conscience grounds his appeal to God.

Hebrews 10:22 speaks of hearts sprinkled clean from an evil conscience, enabling full assurance — the same basis for confidence that John describes.

Hebrews 4:16 invites us to draw near with confidence to God’s throne — the same confidence John says we have when our heart does not condemn us.

2 Corinthians 1:12 boasts in the testimony of a clear conscience — directly paralleling the confidence that comes when our heart does not condemn us.

In 2 Kings 20:3, Hezekiah appeals to his faithful walk and whole heart before God, exemplifying the confidence that comes when one's heart does not condemn.

Romans 14:22 describes the blessing of not passing judgment on oneself, directly paralleling a heart that does not condemn.

John 15:10 shows that keeping commandments leads to abiding in Christ's love, the same basis for the confidence here.

John 9:31 states God hears those who do his will, a direct parallel to the confidence before God when our heart is clear.

Psalm 119:6 promises no shame for those who fix their eyes on God's commandments, similar to the boldness of a heart that does not condemn.

1 Samuel 24:5 shows David’s heart striking him after cutting Saul’s robe — the opposite of a non-condemning heart, highlighting the contrast.

In 1 Corinthians 4:4, Paul says a clear conscience does not make him righteous — contrasting with John’s confidence from a non-condemning heart.

2 Corinthians 13:5 urges self-examination to confirm faith, which corresponds to the confidence that comes from a clear heart.

Job 22:26 promises delight and lifted face to God when righteous—here a clear heart brings similar boldness.