Verse 28 commands self-examination before communion — verse 31 explains that doing so avoids the judgment described in verse 30.

Psalm 32:3-5 describes unconfessed sin causing physical suffering, but confession brings forgiveness — mirroring the principle of self-judgment here.

Luke 15:18-20 portrays the prodigal's self-judgment and humble return, resulting in mercy — illustrating the benefit of judging oneself.

In 1 John 1:9, confessing sins is the parallel act of self-judgment that brings forgiveness and avoids divine judgment.

In Revelation 2:5, the call to repent echoes self-judgment — doing so prevents Christ's judgment of removing the lampstand.

In Revelation 3:3, repentance is urged to avoid Christ's coming in judgment — directly parallels self-judgment to escape judgment.

Lamentations 3:40 urges testing and examining our ways — the same self-judgment Paul calls for in 1 Corinthians 11:31.

2 Corinthians 13:5 commands self-examination to test faith — a direct parallel to Paul's call in 1 Corinthians 11:31 to judge ourselves.

Jeremiah 31:18-20 shows Ephraim confessing his discipline and being restored — an OT parallel to self-judgment averting divine judgment.

In Revelation 3:2, waking up and strengthening what remains implies self-examination to avoid judgment, a similar warning.